🕷️ Spidikor Notes

2-(tert-Butylamino)-1-(3-chlorophenyl)propan-1-one

Amfebutamone

Wellbutrin

Bupropion

Notes:

1. Pharmacokinetic and pharmacodynamic of bupropion: integrative overview of relevant clinical and forensic aspects 

2. Bupropion for major depressive disorder: Pharmacokinetic and formulation considerations

2.1 CYP2B6 metabolizes Bupropion into Hydroxybupropion.

2.2 Bupropion lowers the seizure threshold, increasing the risk of seizures.

2.3 Bupropion is a strong CYP2D6 inhibitor.

3. Bioequivalance and therapeutic equivalence of generic and brand bupropion in adults with major depression: A randomized clinical trial

3.1 Bupropion is FDA-approved for major depressive disorder (MDD), seasonal affective disorder (SAD), and smoking cessation.

4. Chiral Plasma Pharmacokinetics and Urinary Excretion of Bupropion and Metabolites in Healthy Volunteers

4.1 Bupropion intake creates 3-Chlorocathinone (Hydroxybupropion), 3-Chloroephedrine (Erythrohydrobupropion), 3-Chloropseudoephedrine (Threohydrobupropion) and 3-Chloro-hydroxyphenmetrazine (S,S- and R,R-Hydroxybupropion) analogues via metabolism.

5. Convulsive liability of bupropion hydrochloride metabolites in Swiss albino mice

5.1 Bupropion’s metabolites are primarily responsible for its convulsive effects in animals, with a rank order potency of Hydroxybupropion > Threohydrobupropion > Erythrohydrobupropion > Bupropion.

6. Effects of Hydroxymetabolites of Bupropion on Nicotine Dependence Behavior in Mice

6.1 S,S-Hydroxybupropion is active against Nicotine reward, and partially substitutes for Nicotine.

7. CYP2B6 and bupropion’s smoking cessation pharmacology: the role of hydroxybupropion

7.1 Having Hydroxybupropion serum levels of 0.7ug/mL (2.8uM) makes Bupropion effective for smoking cessation. Below this threshold, Bupropion does not aid smoking cessation. Hydroxybupropion is largely responsible for Bupropion’s antismoking effects. Hydroxybupropion levels predicted successful smoking cessation and continued abstinence, while Bupropion levels did not.

8. Influence of CYP2B6 genetic variants on plasma and urine concentrations of bupropion and metabolites at steady state

8.1 Poor CYP2B6 metabolizers have lower antismoking efficacy.

8.2 Bupropion is metabolized by CYP2B6, and a genetic variant of this enzyme has large effects on efficacy in MDD and smoking cessation.

9. Synthesis and Characterization of In Vitro and In Vivo Profiles of Hydroxybupropion Analogues: Aids to Smoking Cessation

10. Comparison of the Effects of Antidepressants and Their Metabolites on Reuptake of Biogenic Amines and on Receptor Binding

11. Transdermal delivery of bupropion and its active metabolite, hydroxybupropion: a prodrug strategy as an alternative approach

12. Pharmacokinetic and pharmacodynamic of bupropion: integrative overview of relevant clinical and forensic aspects 

13. Bupropion and Bupropion Analogs as Treatments for CNS Disorders

14. Bupropion for attention deficit hyperactivity disorder (ADHD) in adults

14.1 Low quality evidence suggests use in attention-deficit/hyperactivity disorder (ADHD).

15. Practice patterns of bupropion co-prescription with antipsychotic medications

15.1 Bupropion appears to be underutilized for smoking cessation in schizophrenia, presumably due to the thought that its dopaminergic (DAergic) effects may exacerbate psychosis. This, however, is uncommon, likely because Bupropion is not substantially DAergic, but rather is predominantly noradrenergic (NEergic) in its action.

16. Efficacy of dextromethorphan for the treatment of depression: a systematic review of preclinical and clinical trials

17. Bupropion: a systematic review and meta-analysis of effectiveness as an antidepressant

17.1 Bupropion has high-quality evidence of superiority to placebo against depression, and comparable efficacy to other antidepressants when compared head-to-head. Most studies show increased efficacy compared to monotherapy when used with another agent when used as an add-on.

17.2 Bupropion has a very low rate of sexual side effects compared to serotonergics, and may improve the sexual dysfunction caused by SSRIs. Bupropion is more likely to cause weight loss than gain.

18. A Review of the Neuropharmacology of Bupropion, a Dual Norepinephrine and Dopamine Reuptake Inhibitor

18.1 Bupropion is not clinically serotonergic in any meaningful regard.

18.2 Bupropion is an NE-DA reuptake inhibitor (NDRI). It is also a noncompetitive antagonist at nicotinic acetylcholine (ACh) receptors (nAChRs), mostly via its metabolites.

18.3 The brain:plasma ratio is ~10:1.

18.4 Therapeutic doses lead to brain levels of Bupropion and its metabolites that are above the IC50s for the DA transporter (DAT) and NE transporter (NET) throughout the typical 12h dosing interval for Bupropion SR.

18.5 Bupropion treatment prevents the development of SAD relapse.

18.6 Most frequent side effects were dry mouth 16%, nausea 12.5%, and insomnia 10.5%.

18.7 Seizure risk is 0.1% in the general population, and 0.4% for patients on Bupropion IR 450mg/d. At 600mg/d Bupropion IR, the risk jumps to 4%.

19. Deconstructed Analogues of Bupropion Reveal Structural Requirements for Transporter Inhibition versus Substrate-Induced Neurotransmitter Release

19.1 Due to the bulky amine substituent, Bupropion is not an NE-DA releasing agent (NDRA), but rather an NDRI. Bulky N-substituted cathinones are not substrates of NET or DAT, nor are they releasing agents.

19.2 Bupropion itself has a DAT IC50 of 304-945nM.

20. Rates of Anomalous Bupropion Prescriptions in Ontario, Canada

21. Bupropion increases striatal vesicular monoamine transport

21.1 Bupropion rapidly, reversibly, and dose-dependently increased striatal DA uptake by VMAT2, an effect common to DRIs. This depends on D2 receptor agonism, as it was reversed with a D2 antagonist.

22. Possible involvement of sigma‐1 receptors in the anti‐immobility action of bupropion, a dopamine reuptake inhibitor

22.1 Bupropion is a sigma1 agonist. Its antidepressant-like effects in an animal model depend on sigma1. The addition of sigma1 agonists turned a sub-effective dose of Bupropion into an effective one, and sigma1 antagonists blocked the antidepressant-like effects in the forced swim test (FST) in mice.

23. Revisiting bupropion anti-inflammatory action: involvement of the TLR2/TLR4 and JAK2/STAT3

23.1 Bupropion may be pro-inflammatory at supraphysiologic levels of 50-100uM in vitro.

24. Bupropion for Interferon-Alpha-Induced Depression in Patients with Hepatitis C Viral Infection: An Open-Label Study

24.1 Bupropion reduces depressive and negative somatic effects induced by interferon-alpha (IFN-alpha) treatment for Hepatitis C (HepC). 90% of the 10 (9/10) participants responded to IFN-alpha, as compared to 60% in most situations. However, the sample size was low, and so it is difficult to draw any conclusions.

25. 15 Years of Clinical Experience With Bupropion HCl: From Bupropion to Bupropion SR to Bupropion XL

25.1 Bupropion is available in IR, SR, and XL, for 3x/d, 2x/d, and 1x/d administration. These are bioequivalent, dosage-wise. Bupropion XL provides the lowest bedtime plasma levels, which may improve the sleep disruption potential.

25.2 Bupropion separated significantly from placebo in preventing MDD relapse. Bupropion halved the risk of depressive relapse. Time to relapse was 44w in the Bupropion group and 24w in the placebo group.

25.3 Bupropion had a lower chance of conversion to mania in bipolar I disorder (BDI) than Desipramine over 1y, despite having comparable efficacy for BD depression.

25.4 Bupropion is more effective than placebo for weight loss. Bupropion causes some weight loss in higher-BMI users, while no weight change is observed in low-to-middle weight people.

25.5 Bupropion SR 300mg/d is not associated with increased risk of seizures.

25.6 Bupropion + Nicotine patch was more likely to result in hypertension than either group alone.

26. Modification of norepinephrine and serotonin, but not dopamine, neuron firing by sustained bupropion treatment

26.1 Firing rates of NE neurons are reduced by 80% with 30mg/kg (an equivalent dose to 338mg/d for a 70kg human) by long-term and acute administration, similarly to other amphetamine derivatives. This is caused by alpha2 agonism by NE, providing negative feedback on its own release.

26.2 At the highest concentration, Bupropion increased the firing rate of serotonin (5-HT) neurons by 2x, an effect that depended on NE.

27. Bupropion monotherapy alters neurotrophic and inflammatory markers in patients of major depressive disorder

27.1 After 12w of treatment, Bupropion increased serum brain-derived neurotrophic factor (BDNF) by 22.7% in MDD patients, and decreased tumor necrosis factor-alpha (TNF-alpha).

28. Hybrid Dopamine Uptake Blocker–Serotonin Releaser Ligands: A New Twist on Transporter-Focused Therapeutics

29. Analgesic and anti-inflammatory activities of bupropion in animal models

29.1 40mg/kg IP in mice reduced acetic acid-induced abdominal writhing, prevented both initial (nociceptive) and later (inflammatory) stages of formalin-induced behavior, and showed significant analgesia in the hot plate test. This indicated that Bupropion displays analgesic effects in mice.

29.2 Bupropion 40mg/kg IP showed considerable anti-inflammatory activity against carrageenan

29.3 Lowers production of TNF-alpha and IFN-gamma

29.4 Bupropion may be effective for neuropathic pain.

29.5 Bupropion is not superior to placebo for non-neuropathic lower back pain.

30. Bupropion Administration Increases Resting-State Functional Connectivity in Dorso-Medial Prefrontal Cortex

30.1 Compared to placebo, 7d of Bupropion increased resting-state functional connectivity (RSFC) between the dorsomedial prefrontal cortex (dmPFC) and the posterior cingulate cortex (PCC) and the precuneus cortex in healthy humans. These are key nodes in the default-mode network (DMN).

31. Review of the Pharmacology and Clinical Profile of Bupropion, an Antidepressant and Tobacco Use Cessation Agent

31.1 Bupropion facilitates the acquisition of Nicotine-induced conditioned place preference (CPP) in rats, a measure of reward.

31.2 Bupropion inhibits Nicotine withdrawal in animal models and humans.

31.3 Bupropion attenuates Nicotine-induced Nicotine reinstatement in rats, but there are large interindividual differences.

32. Methamphetamine-like discriminative stimulus effects of bupropion and its two hydroxy metabolites in male rhesus monkeys

32.1 High doses of Bupropion and S,S- and R,R-Hydroxybupropion fully substitute for Methamphetamine in male rhesus monkeys. Nicotine substitutes as well, so nAChR antagonism may be involved in these effects.

33. Bupropion, methylphenidate, and 3,4-methylenedioxypyrovalerone antagonize methamphetamine-induced efflux of dopamine according to their potencies as dopamine uptake inhibitors: implications for the treatment of methamphetamine dependence

33.1 Bupropion reduced Methamphetamine-induced DA efflux in vitro.

34. Bupropion SR worsens mood during marijuana withdrawal in humans

34.1 Bupropion produced no negative interactions with Cannabis in active users, but worsened irritability, negative mood, restlessness, and trouble sleeping during Cannabis withdrawal.

35. Bupropion in Depression: I. Biochemical Effects and Clinical Response

35.1 Plasma Homovanillic acid (HVA; a DA metabolite) increased significantly in nonresponders but not responders.

35.2 Bupropion reduced whole-body turnover of NE without altering NE plasma levels at rest or during orthostatic challenge. There was a trend toward reduction in MHPG (an NE metabolite) and HVA concentrations following treatment.

36. A new chapter opens in anti-inflammatory treatments:The antidepressant bupropion lowers production of tumor necrosis factor-alpha and interferon-gamma in mice 

36.1 Bupropion profoundly reduces TNF-alpha, IFN-gamma, and interleukin-1beta (IL-1beta) in an LPS mouse model of inflammation. Mice were protected by Bupropion from what would otherwise be a lethal LPS dose. It also increased IL-10. The TNF suppression depended largely on beta-adrenergic and D1 receptor agonism. Increasing Cyclic Adenosine monophosphate (cAMP) suppresses TNF.

37. The pharmacologic basis for therapeutic interest in bupropion

38. Studies of bupropion's mechanism of antidepressant activity

38.1 Bupropion reduces DA turnover in the brain.

39. Dopamine transporter-dependent induction of C-Fos in HEK cells

39.1 Bupropion increased c-Fos approximately 3x in human DAT (hDAT)-expressing HEK-293 cells in vitro when administered alone, and decreased DA-induced c-Fos if coincubated with DA. DA-induced c-Fos induction involved oxidative stress, and 50% was attributable to PKC activation.

40. Bupropion: a review of its mechanism of antidepressant activity

40.1 Increases excretion of the hydroxy metabolite of Melatonin (MT), an NEergic effect.

41. Behavioral and biochemical effects of the antidepressant bupropion (Wellbutrin): evidence for selective blockade of dopamine uptake in vivo

42. A Controlled Clinical Trial of Bupropion for Attention Deficit Hyperactivity Disorder in Adults

42.1 Bupropion SR up to 400mg/d reduced ADHD symptoms by 42% (vs placebo’s 24%). The percentage of ADHDers who showed a ≥30% reduction in symptoms was 76%, vs placebo’s 37%. On the clinical global impression (CGI), 52% of patients were rated either much improved or very much improved compared to 11% on placebo.

43. Bupropion Hydrochloride in Attention Deficit Disorder with Hyperactivity 

43.1 In hyperactive ADHDers, a significant positive effect was found after 3d for hyperactivity and conduct problems on the teacher’s checklist. A positive effect occurred after 28d in conduct problems and restless-impulsive behavior on parent ratings.

44. Bupropion versus Methylphenidate in the Treatment of Attention-Deficit Hyperactivity Disorder

44.1 Bupropion was equally effective to Methylphenidate in treatment of ADHD.

45. Bupropion treatment of attention-deficit hyperactivity disorder in adults | American Journal of Psychiatry 

46. A Placebo-Controlled Trial of Bupropion SR as an Antidote for Selective Serotonin Reuptake Inhibitor-Induced Sexual Dysfunction

46.1 In patients on SSRIs, Bupropion SR increased sexual desire and frequency of sexual activity compared to placebo.

47. Substitution of an SSRI With Bupropion Sustained Release Following SSRI-Induced Sexual Dysfunction

48. Is the inhibition of nicotinic acetylcholine receptors by bupropion involved in its clinical actions?

48.1 Bupropion binds to nAChRs in resting state, reducing open probability. It speeds the desensitization process. Bupropion binds to the same site of nAChRs as Phencyclidine (PCP) and tricyclic antidepressants (TCAs).

49. Anti- and pro-inflammatory considerations in antidepressant use during medical illness: bupropion lowers and mirtazapine increases circulating tumor necrosis factor-alpha levels

50. Enhanced neural response to anticipation, effort and consummation of reward and aversion during bupropion treatment

50.1 In healthy humans, 7d of 150mg/d Bupropion treatment increased ventromedial PFC (vmPFC) and caudate activity during the anticipation of reward or unpleasant taste. During the effort phase (pushing a button to achieve a pleasant taste or avoid an unpleasant taste), it increased activity in the vmPFC, striatum, dorsal anterior cingulate cortex (dACC), and primary motor cortex. During the consummatory phase, it increased activity in medial orbitofrontal cortex (mOFC), amygdala, and ventral striatum. This suggests positive effects on reward-related processing in humans.

51. Randomized, placebo-controlled trial of bupropion for the treatment of methamphetamine dependence

51.1 In lighter Methamphetamine users (Using <18d in the last 30d), 12w of Bupropion SR 300mg/d reduced Methamphetamine use compared to placebo. Bupropion did not reduce Methamphetamine use in heavier users (>18d/30d use). Bupropion reduced smoking by 4.85 cigarettes/d compared to placebo.

52. A Retrospective Analysis of Two Randomized Trials of Bupropion for Methamphetamine Dependence: Suggested Guidelines for Treatment Discontinuation/Augmentation

53. Bupropion Attenuates Methamphetamine Self-Administration in Adult Male Rats

54. Comparison of the effects of methamphetamine, bupropion and methylphenidate on the self-administration of methamphetamine by rhesus monkeys

55. Bupropion Reduces Methamphetamine-Induced Subjective Effects and Cue-Induced Craving

55.1 In human Methamphetamine users, 6d of Bupropion SR reduced the subjective effects of up to 30mg IV Methamphetamine (a relatively low dose for active users), with reduced ratings for “any drug effect” and “high” compared to placebo. Bupropion also reduced cue-induced Methamphetamine craving in non-treatment seeking Methamphetamine addicts. Bupropion blunted Methamphetamine-induced heart rate increases.

56. Neurochemical and neuropharmacological investigations into the mechanisms of action of bupropion . HCl--a new atypical antidepressant agent

57. Labeling in vivo of sigma receptors in mouse brain with [ 3 H]-(+)-SKF 10047: Effects of phencyclidine, (+)- and (−)-N-allylnormetazocine, and other drugs

57.1 Binds to rat sigma1 with IC50 580nM-2.1uM.

58. Acute effect of the anti-addiction drug bupropion on extracellular dopamine concentrations in the human striatum: An [11C]raclopride PET study

58.1 Acute administration of 150mg Bupropion SR in humans did not produce an increase in extracellular DA in the striatum during peak levels, as measured by [11C]Raclopride positron emission tomography (PET) binding. This does not preclude the possibility of mild DAergic effects with chronic administration.

58.2 In rats, acute administration of Bupropion does robustly increase the DA level in the striatum.

~NOTE~ Likely due to differing pharmacokinetics. Bupropion is the main drug in plasma in rats, whereas it has the lowest concentration out of its metabolites at steady state in humans with functional CYP2B6).

59. In vivo activity of bupropion at the human dopamine transporter as measured by positron emission tomography

59.1 With Bupropion SR 300mg/d for 11d (steady state), 3h after the last dose, DAT occupancy in humans averaged 26%, which was maintained for 24h.

60. Bupropion occupancy of the dopamine transporter is low during clinical treatment

60.1 In another study, Bupropion treatment of depression in humans resulted in DAT occupancy of ~14%.

61. Enantioselective Effects of Hydroxy Metabolites of Bupropion on Behavior and on Function of Monoamine Transporters and Nicotinic Receptors

61.1 S,S-Hydroxybupropion has an IC50 for the NET of 520nM, whereas R,R-Hydroxybupropion is completely inactive up to 10uM. Racemic Bupropion has an IC50 for the NET of 1.9uM, and racemic S,S-, R,R-Hydroxybupropion has a NET IC50 of 1.7uM. S,S-Hydroxybupropion has an alpha4beta2 nAChR IC50 of 3.3uM, and is more potent than its R,R-enantiomer. S,S-Hydroxybupropion and Bupropion are more potent in mouse models of depression than R,R-Hydroxybupropion, and in Nicotine antagonism in vivo.

62. Involvement of nitric oxide (NO) signaling pathway in the antidepressant action of bupropion, a dopamine reuptake inhibitor

62.1 L-Arginine (Arg) inhibited Bupropion’s antidepressant-like effects in a mouse model, and a nitric oxide (NO) synthase (NOS) inhibitor enhanced them. 10mg/kg Methylene Blue also enhanced the antidepressant-like effects of Bupropion. Sildenafil (a phosphodiesterase type 5 (PDE5) inhibitor) also inhibited Bupropion’s antidepressant effects. This suggests inhibition of the NOS/NO/cGMP pathway enhances Bupropion’s antidepressant-like effects, and conversely, stimulation of this pathway reduces its antidepressant-like effects.

63. WELLBUTRIN XL™

63.1 Bupropion reaches steady-state in 8d in humans.

63.2 Tmax for Bupropion XL is 5h for Bupropion and 7h for Hydroxybupropion, Erythrohydrobupropion and Threohydrobupropion.

63.4 Bupropion is 84% plasma protein-bound (PPB). Hydroxybupropion has similar PPB, but Threohydrobupropion’s PPB is only ~42%.

63.5 The area under the curve (AUC) for Hydroxybupropion is ~13x that of Bupropion itself at steady state.

63.6 The AUC of Erythrohydrobupropion is 1.3x that of Bupropion.

63.7 Threohydrobupropion has an AUC 7x that of Bupropion.

63.8 Bupropion and its metabolites are 87% excreted in urine, and 10% is excreted in feces. The unchanged fraction was 0.5%, indicating extensive metabolism.

63.9 Smoking status does not influence metabolism of Bupropion.

63.10 Orphenadrine, Thiotepa, Cyclophosphamide, Paroxetine, Sertraline, Norfluoxetine, Fluvoxamine, Nelfinavir, Ritonavir, and Efavirenz can inhibit or are substrates of CYP2B6 and therefore inhibit the hydroxylation of Bupropion into Hydroxybupropion.

63.11 Cimetidine 800mg increases the AUC and Cmax of Erythrohydrobupropion and Threohydrobupropion.

63.12 Bupropion is a strong CYP2D6 inhibitor, leading to 5x increases in AUC of one dose of the CYP2D6 substrate Desipramine. After chronic dosing, this effect lasts up to 7d after the last dose of Bupropion.

63.13 Bupropion may reduce alcohol (ethanol; EtOH) tolerance in some people.

63.14 At 2x and 7x the maximum human dose in rats, but not mice, there was an increase in nodular proliferative lesions of the liver. This did not result in any increase in malignancies.

63.15 Bupropion may be mutagenic according to some (but not other) in vitro data.

63.16 Bupropion is Pregnancy Category B in the US, with no animal evidence of teratogenicity.

63.17 Bupropion XL has not been directly compared to placebo in human clinical trials, but is bioequivalent to the IR and SR formulations, both of which have shown efficacy compared to placebo.

63.18 Bupropion is relatively safe in overdose, despite seizures being common.

64. Six-Month Trial of Bupropion With Contingency Management for Cocaine Dependence in a Methadone-Maintained Population

64.1 In a 25w, randomized, placebo-controlled, double-blind trial, 106 opioid-dependent Cocaine abusers were treated with contingency management (CM; a program for positive reinforcement of abstinence) + either placebo or 300mg/d Bupropion. Other groups received voucher control (VC) + placebo, or VC + 300mg/d Bupropion. All patients received Methadone 60-120mg to maintain abstinence from opioids for the study duration. Bupropion or placebo was initiated at 3w. Opiate use decreased significantly, and equivalently for all groups. In the CM + Bupropion group, the proportion of Cocaine+ urine samples significantly decreased during weeks 3-13 relative to week 3 and remained low during weeks 14-25. In the CM + placebo group, Cocaine use significantly increased during weeks 3-13 relative to week 3, but then Cocaine use significantly decreased relative to the initial slope during weeks 14-25. By 25w, both of the VC groups (VC + either Bupropion or placebo), showed no significant improvement in Cocaine use. Thus, combining Bupropion with CM to treat Cocaine addiction may be a promising strategy. The early treatment effect of Bupropion implies that it may alleviate Cocaine withdrawal symptoms.

64.2 In a placebo-controlled study, 149 Cocaine abusers were treated with Bupropion for 12w. Overall, Bupropion was not different from placebo in reducing Cocaine use. However, it was significantly effective in a subset of depressed patients at decreasing Cocaine use.

64.3 Bupropion may reduce impulsivity and increase concentration. Several studies support its use in ADHD treatment.

65. A Novel, Nonbinary Evaluation of Success and Failure Reveals Bupropion Efficacy Versus Methamphetamine Dependence: Reanalysis of a Multisite Trial

65.1 Bupropion was tested for 12w for its usefulness in Methamphetamine addiction. In the Bupropion group, 20% of participants achieved ≥2w of end-of-study abstinence (EOSA), 14% achieved ≥6w EOSA, and 6% were abstinent throughout the trial. In the placebo group, 7% had ≥2w EOSA, 4% had ≥6w EOSA, and 1% were abstinent throughout. Thus, Bupropion seems to be effective for producing improvements in Methamphetamine use. The odds of achieving ≥2w EOSA in the Bupropion and placebo groups were 25.4% and 7.46%, respectively, yielding an odds ratio (OR) of 4.22. Bupropion was most effective in those who reported ≤18d/mo of baseline Methamphetamine use (OR = 7.26 for Bupropion vs placebo in this subgroup), and there was a trend-level decrease in Methamphetamine use (OR = 2.96) in users who reported 19-29d/mo baseline Methamphetamine use.

65.2 Bupropion significantly reduced the self-administration of Methamphetamine in monkeys at a dose that did not alter responding for food.

65.3 In a placebo-controlled human laboratory study, Bupropion SR 150mg 2x/d significantly reduced self-reported drug cravings in response to Methamphetamine-associated cues, and significantly reduced the reported subjective effects of 15-30mg IV Methamphetamine. Bupropion significantly attenuated the ability of IV Methamphetamine to increase heart rate, and produced a trend-level diminution of Methamphetamine-induced increases in blood pressure.

66. Effect of bupropion on dopamine and 5-hydroxytryptamine-mediated behaviour in mice | Journal of Pharmacy and Pharmacology | Oxford Academic 

66.1 When 12.5-50mg/kg Bupropion was administered 30min before Methamphetamine, it significantly antagonized Methamphetamine-induced stereotypic behavior in mice, but when given 5min after Methamphetamine, it significantly potentiated stereotypy.

66.2 When Bupropion was administered to mice pretreated with the non-selective, irreversible monoamine oxidase inhibitor (MAOI) Pargyline at 100mg/kg, intense locomotor stimulation and stereotypy was observed.

66.3 When Bupropion was administered to mice pretreated with Clomipramine, the mice showed locomotor stimulation, head twitches, and abduction and extension of hind limbs. Unlike Clomipramine, Bupropion failed to potentiate the 5-HT-mediated behavior seen after 5-Hydroxytryptophan (5-HTP) 100mg/kg IV.

67. Bupropion Binds to Two Sites in the Torpedo Nicotinic Acetylcholine Receptor Transmembrane Domain

67.1 Bupropion acts as a noncompetitive antagonist of nAChRs. Bupropion binds to its site on nAChRs with 3x higher affinity for the desensitized state (IC50 = 1.2uM) than the resting state.

67.2 Bupropion and its analogues noncompetitively inhibit both muscle-type (fetal human alpha1beta1gamma-delta and Torpedo) and neuronal (alpha4beta2, alpha3beta4, alpha7) nAChRs in the low-to-intermediate uM range (IC50 values range from 0.4-60uM), with a rank order of potency: alpha3>alpha1~alpha4>alpha7-containing nAChRs.

67.3 In HEK-293 cells expressing alpha1beta1epsilon-delta (adult human muscle-type) nAChRs, Bupropion inhibits the channels via 2 mechanisms mediated by binding to specific conformational states. Bupropion binding to the resting nAChR results in impaired channel opening (IC50 = 0.4uM), while binding to the open state results in either a slow channel block or an increase in the rate of desensitization. Bupropion binds to the desensitized state with ~2x higher affinity than to the resting (closed) state. Molecular docking and dynamics simulations predict that Bupropion binds near the middle of the nAChR ion channel (between M2-6 and M2-13). Based on in vitro studies, it was revealed that Bupropion does in fact bind in the middle (M2-9) of the Torpedo nAChR ion channel in the resting and desensitized states. In the desensitized state, Bupropion also binds in proximity to alphaTyr213 in alphaM1, a residue that resides within a Halothane/general anesthetic binding pocket.

67.4 When Torpedo nAChRs were injected into Xenopus oocytes, Bupropion reversibly inhibited ACh-induced currents with an IC50 of 0.3uM, similar to the reported IC50 for Bupropion inhibition of mouse muscle-type nAChRs.

67.5 alphaTyr213 contributes to a water-accessible general anesthetic binding pocket located at the same interface between subunits where uncharged positive and negative nAChR allosteric modulators bind more towards the middle of the transmembrane domain (TMD).

68. Bupropion Inhibits Serotonin Type 3AB Heteromeric Channels at Clinically Relevant Concentrations

68.1 Bupropion is a noncompetitive inhibitor of 5-HT3A receptors. In Xenopus oocytes expressing mouse 5-HT3A and 5-HT3AB receptors, co-application of Bupropion or Hydroxybupropion with 5-HT dose-dependently inhibited 5-HT-induced currents in heteromeric 5-HT3AB receptors (IC50 = 840uM and 526uM, respectively). The corresponding IC50s for Bupropion and Hydroxybupropion for homomeric 5-HT3A receptors were 10x and 5x lower, respectively (87.1uM and 113uM). The inhibition was not use-dependent nor voltage-dependent, suggesting Bupropion is not an open channel blocker of 5-HT3 receptors. The inhibition was reversible and time-dependent. Preincubation with a low concentration of Bupropion that mimics therapeutic drug levels inhibits 5-HT-induced currents in 5-HT3A and 5-HT3AB receptors considerably. The estimated Hill slopes for both Bupropion and Hydroxybupropion for both receptors were greater than unity (1.17-1.8), suggesting the presence of multiple binding sites with a cooperative mechanism. The Hill coefficients for the 5-HT3AB receptor were ~1.4x larger for both Bupropion and Hydroxybupropion as compared with that for the 5-HT3A receptor, which may indicate a concerted conformational change or cooperativity of binding.

68.2 Bupropion, but not its metabolites, concentrates in many tissues with a brain:plasma ratio of 25:1, which results in brain concentrations of ~20uM.

68.3 Hydroxybupropion has an average therapeutic plasma concentration of ~100uM.

69. Orthosteric and Allosteric Ligands of Nicotinic Acetylcholine Receptors for Smoking Cessation

70. Bupropion-induced inhibition of α7 nicotinic acetylcholine receptors expressed in heterologous cells and neurons from dorsal raphe nucleus and hippocampus

70.1 Choline-induced currents in hippocampal interneurons were partially inhibited by 10uM Bupropion, a concentration that is clinically-attainable. Agonist-induced currents were reversibly inhibited by Bupropion at concentrations coinciding with its inhibitory potency (IC50 = 54uM) and binding affinity (Ki = 63uM) for alpha7 nAChRs from heterologous cells. The [3H]Imipramine competition binding and molecular docking results support a luminal location for the Bupropion binding site(s).

71.Dopamine transporter availability in medication free and in bupropion treated depression: A 99mTc-TRODAT-1 SPECT study - ScienceDirect 

71.1 In 12 healthy controls and 16 depressed patients, the baseline DAT activity was examined by single-photon emission computed tomography (SPECT). 9/16 patients went through an additional second SPECT investigation, after 4w of Bupropion treatment. In the depressed patients, the baseline DAT striatum-occipital ratio (SOR) (1.04) was not significantly different from healthy controls. Correlation was found between baseline SOR and HAM-D score change of the Bupropion-treated patients. The average DAT occupancy due to Bupropion treatment was 20.84%. There was no significant correlation between the therapeutic efficacy and DAT occupancy. Thus, DRI actions may not significantly contribute to Bupropion’s efficacy in depressive disorders. Bupropion led to clinical improvement in 4/9 patients, whereas the clinical state of the other 5 patients remained unchanged (53% and 24% mean decrease, respectively, in HAM-D score). In the 9 patients treated with Bupropion, the SOR values were significantly higher at baseline than after 4w of Bupropion treatment. The average DAT occupancy varied within a wide range, with a mean of 20.84% (95% CI: 0-42%). On one occasion, the occupancy was negative (–39%). The DAT availability did not uniformly decrease during effective therapy. Bupropion treatment adherence was not measured, and may have contributed to variable and low occupancy.

71.2 Serum Bupropion levels correlate poorly with its cerebral concentrations. After 8d of Bupropion treatment in healthy individuals, the concentrations of Bupropion and its metabolites were found to fluctuate around the steady-state values.

72. Consistent differential effects of bupropion and mirtazapine in major depression 

72.1 Bupropion excels in treating hypersomnia, weight gain, and fatigue in depression.

72.2 In the STAR*D study, Bupropion monotherapy produced greater improvement in hypersomnia than Venlafaxine in Levels 2 and 2A. Bupropion augmentation outperformed Buspirone augmentation for increased weight, increased appetite, and fatigue in Level 2.

72.3 In the CO-MED study, Escitalopram + Bupropion demonstrated complementary symptom-specific benefits.

72.4 In terms of efficacy across symptoms, the VAST-D study differentiated Bupropion monotherapy from Aripiprazole augmentation, but failed to differentiate Bupropion augmentation and Aripiprazole augmentation, even with 1522 patients, suggesting similar efficacy as augmentation agents.

🕸️ Spidikor Writings

Blood levels are dominated by R,R-Hydroxybupropion in humans. In rats, Bupropion is the main drug present in blood, which explains typical psychostimulant effects in rodents.

S,S-Hydroxybupropion (Radafaxine) is an NDRI, with IC50s of 241nM for NE, 630nM for DA. Also an alpha4beta2 nAChR antagonist with IC50 of 3.3uM. Bupropion and its metabolites inhibit alpha3beta2 and alpha3beta4 receptors with a higher affinity than alpha4beta2.

Threohydrobupropion levels are associated with dry mouth, and it accounts for 21% of CYP2D6 inhibition

Erythrohydrobupropion levels are associated with insomnia, and it accounts for 9% of CYP2D6 inhibition

🤖 Gemini 3.1 Pro Dosage Guide & Overview

Comprehensive Pharmacological and Subjective Profile of Bupropion: Therapeutic Efficacy, Misuse Potential, and User Experiences

Introduction to Bupropion Pharmacology and Clinical Context

Bupropion represents a highly distinct entity within the modern psychopharmacological landscape. Formulated and distributed under various brand names—most notably Wellbutrin, Zyban, Aplenzin, and in combination with naltrexone as Contrave—it is an atypical antidepressant, a smoking cessation aid, and an off-label intervention for a myriad of neurobehavioral conditions.1 Unlike traditional selective serotonin reuptake inhibitors (SSRIs) or serotonin-norepinephrine reuptake inhibitors (SNRIs), which dominate the first-line treatment protocols for major depressive disorder (MDD), bupropion exerts virtually no clinically significant effect on serotonergic transmission.5 Instead, it functions primarily as a norepinephrine-dopamine reuptake inhibitor (NDRI) and as a non-competitive antagonist at neuronal nicotinic acetylcholine receptors (nAChRs).7

The molecular structure of bupropion provides critical insight into its clinical and subjective profile. Structurally, it is an aminoketone and a substituted cathinone, making it the only synthetic cathinone currently approved for medical use by the United States Food and Drug Administration (FDA).2 As a cathinone derivative, it shares a fundamental chemical backbone with amphetamines, diethylpropion, and various illicit central nervous system stimulants often colloquially referred to as "bath salts".2 This structural homology is responsible for the drug’s activating properties, its propensity to induce weight loss, its utility in treating attention-deficit/hyperactivity disorder (ADHD), and, critically, its potential for recreational misuse and dose-dependent neurological toxicity.2

The history of bupropion's clinical deployment further underscores its complex pharmacological nature. Initially introduced to the market in 1985 as a first-generation "modern" antidepressant, it was abruptly withdrawn shortly thereafter following the discovery of an alarmingly high incidence of drug-induced seizures, particularly among patients suffering from bulimia nervosa.11 It was subsequently reformulated and reintroduced in 1989 with strictly lowered maximum daily dosage guidelines.12 Today, it remains a cornerstone therapeutic agent, yet it demands rigorous clinical oversight due to its narrow therapeutic index and the profound ways in which it alters subjective consciousness, energy metabolism, and seizure thresholds.

Pharmacokinetics and Metabolism

The subjective experience of bupropion, including its onset, peak, and duration, is inextricably linked to its complex pharmacokinetic profile. Following oral administration, the parent compound is rapidly absorbed from the gastrointestinal tract.1 However, the parent drug is subject to extensive first-pass hepatic metabolism, primarily mediated by the cytochrome P450 2B6 (CYP2B6) isoenzyme, which converts bupropion into its primary active metabolite, hydroxybupropion.1 Additional non-CYP-mediated metabolic pathways reduce the compound into erythrohydrobupropion and threohydrobupropion.1

These three primary metabolites are entirely biologically active. While they demonstrate a reduced potency of approximately 20% to 50% relative to the parent compound, they accumulate in the blood plasma at significantly higher concentrations.1 Furthermore, the temporal dynamics of these metabolites govern the drug's long-term subjective effects. While the parent bupropion molecule exhibits a relatively brief distribution half-life of 3 to 4 hours, hydroxybupropion boasts a half-life of roughly 20 hours, erythrohydrobupropion 33 hours, and threohydrobupropion up to 37 hours.1 The ultimate elimination half-life of the combined active systemic load is approximately 21 hours.1

This extensive metabolic conversion and prolonged half-life dictate that bupropion must be titrated slowly. It also explains why therapeutic efficacy is rarely immediate, typically requiring two to four weeks of sustained dosing to achieve a steady-state plasma concentration and subsequent receptor downregulation necessary for clinical antidepressant action.1 Genetic polymorphisms in the CYP2B6 enzyme can significantly alter this profile; individuals who are extensive metabolizers may experience rapid peaks and subsequent crashes, while poor metabolizers may accumulate toxic levels of the parent compound, thereby increasing the risk of adverse neurological events.13

Comprehensive Dosing and Duration Guide

Bupropion’s subjective effects and safety profile vary drastically depending on the specific formulation—Immediate Release (IR), Sustained Release (SR), and Extended Release (XL)—as well as the chosen Route of Administration (RoA). To minimize the risk of dose-dependent seizures, strict clinical guidelines dictate that single oral doses should never exceed 150 mg for IR, 200 mg for SR, or 450 mg for XL formulations.14

The following tables synthesize standard clinical prescribing limits, toxicological thresholds, and subjective reports from extensive community tracking, establishing a tiered dosing framework for the two most highly documented routes of administration: Oral (PO) and Intranasal (IN).

Oral Administration (PO) Dosing Tiers

Oral administration is the exclusive medically approved route for bupropion. The extended and sustained-release matrices heavily influence the absorption rate, thereby modulating the peak plasma concentrations and subjective intensity.

Note: Sustained Release (SR) and Extended Release (XL) tablets rely on specialized structural matrices and coatings to control drug dissolution. Splitting, crushing, or chewing these formulations instantly destroys the release mechanism, effectively converting the entire dosage into an immediate-release bolus, which exponentially increases the risk of seizures and acute toxicity.9

Intranasal Administration (IN) Dosing Tiers

Insufflation (snorting) of crushed bupropion tablets intentionally circumvents gastrointestinal absorption and first-pass hepatic metabolism. This delivers the parent drug directly across the highly vascularized nasal mucosa into the systemic circulation, resulting in a massive, rapid spike in dopamine transporter (DAT) occupancy.10 This route is strictly associated with illicit misuse, recreational experimentation, and profound physical harm.

Temporal Profile: Duration of Effects

The timeline of bupropion's subjective effects is highly dependent upon the specific formulation administered and the chosen route. Because of the complex interplay between the parent compound and its long-lived metabolites, the transition between phases can be prolonged.

Oral Administration (PO) Duration (Based on Immediate Release)

• Time till Onset: 40 to 60 minutes. The user typically notices a subtle, gradual shift in wakefulness, a lifting of brain fog, and the onset of mild physical stimulation.22 Peak serum concentrations for the IR formulation are achieved at 2 hours, SR at 3 hours, and XL at approximately 5 hours.1
• Come Up Window: 60 to 90 minutes. Energy levels rise steadily. Users frequently report an accompanying mild increase in heart rate, enhanced cognitive clarity, and a general brightening of mood.22
• Peak: 90 minutes (specifically for IR). This phase represents the maximum subjective stimulation, acute focus, and cognitive euphoria prior to metabolic stabilization.22
• Plateau: 8 to 12 hours. This represents the total action duration for a single active dose. The primary subjective effects level out into a sustained, functional state of alertness, emotional stability, and craving suppression.1 For XL formulations, this plateau is heavily extended across a 24-hour period.16
• Comedown / Offset: 5 to 8 hours post-peak. Often described subjectively by users as a distinct "crash," this period is characterized by a rapid return to baseline energy levels, occasional spikes of irritability, and a sudden onset of physical fatigue.22
• After-effects: 1 to 2 days. Due to the extraordinarily long elimination half-lives of the active metabolites (up to 37 hours), residual stimulation, persistent appetite suppression, and mild insomnia can remain perceptible long after the primary mood-elevating effects have faded.1

Intranasal Administration (IN) Duration

• Time till Onset: 30 to 120 seconds. Absorption through the highly vascularized nasal mucosa is nearly instantaneous, forcing the drug directly into the bloodstream.22
• Come Up Window: 1 to 5 minutes. A rapid, forceful onset of intense stimulation and euphoria. This is universally accompanied by severe, excruciating nasal pain due to the caustic nature of the pill binders and the chemical itself.22
• Peak: 5 to 20 minutes. The absolute height of the "rush." Because insufflation leads to rapid 50% DAT occupancy, this brief window is where the drug most closely mimics the pharmacological profile of illicit amphetamines or cocaine.22
• Plateau: Rare or non-existent. The pharmacokinetic curve of insufflated bupropion is highly erratic; the extreme peak is not sustained, and the experience is highly transient.22
• Comedown / Total Duration: 20 to 180 minutes. The rapid dissipation of the parent drug from the plasma leads to an abrupt, harsh, and dysphoric comedown. Users are frequently left feeling exhausted, highly anxious, and intensely craving an immediate redose.22

Primary Subjective Benefits and Therapeutic Utility

Bupropion occupies a unique therapeutic niche due to its distinctly activating profile. For individuals suffering from specific subtypes of depression—particularly those characterized by anergia, psychomotor retardation, profound fatigue, and hypersomnia—bupropion acts as a highly targeted, energizing intervention.31

Cognitive Euphoria, Mood Elevation, and Energy Restoration

In low to regular oral doses, bupropion produces a mild, usually pleasant state of cognitive euphoria. While clinical literature often categorizes this simply as mood improvement or antidepressant response, subjective reports from individuals utilizing the medication provide a more nuanced picture. Users frequently describe a distinct feeling of "lightness," a sudden return of intrinsic motivation, and an underlying sense of foundational well-being.16

Traditional SSRIs are notoriously associated with emotional blunting, apathy, and a general flattening of affect. In stark contrast, bupropion preserves, and often actively enhances, the brain's reward pathways.32 Users routinely report a renewed interest in long-abandoned hobbies, increased spontaneous sociability, and a heightened capacity to experience genuine joy.16 At clinically unremarkable therapeutic doses, certain individuals report experiencing a cognitive euphoria that is subjectively on par with mild amphetamine use, characterized by an eager desire to engage in complex physical or mental tasks and a sense that life has regained its vibrancy.22

Focus, Motivation, and Off-Label ADHD Management

Because bupropion elevates synaptic concentrations of dopamine and norepinephrine—the precise neurotransmitters targeted by classic central nervous system stimulants like methylphenidate and dextroamphetamine—it is frequently and successfully prescribed off-label for the management of Attention-Deficit/Hyperactivity Disorder (ADHD).1

Subjective experiences highlight significant motivation enhancement. Users describe becoming more talkative, displaying an increased interest in mundane or repetitive tasks, and experiencing a profound "slowing down" of chaotic, racing thoughts.22 The focus provided by bupropion is generally described in community reports as "smoother," more subtle, and less forceful than that of traditional stimulants. It allows for increased executive function and working memory capacity without the intense, sometimes uncomfortable "hyper-focus" or the profound, debilitating afternoon crashes strictly associated with amphetamine derivatives.22

Furthermore, users specifically note that bupropion provides an "extra half-second" of processing time, allowing them to pause, evaluate their impulses, and make conscious choices rather than reacting reflexively.36 However, indirect clinical comparisons indicate that bupropion is generally less efficacious than pure amphetamines for severe, hyperactive-type ADHD, serving rather as a highly effective second-line or adjunctive treatment. It is particularly valuable for individuals who suffer from comorbid substance abuse disorders, or those who simply cannot tolerate the severe cardiovascular stimulation or anxiety induced by standard ADHD medications.14

Craving Suppression and Addiction Management

Bupropion's non-competitive antagonism at nicotinic acetylcholine receptors (nAChRs), combined with its dopaminergic reward-pathway stimulation, makes it a highly effective tool for smoking cessation. It was famously marketed specifically for this purpose under the brand name Zyban.14

Subjective user reports emphasize a fascinating mechanism regarding its anti-addiction properties: the drug does not necessarily induce a physical aversion or sickness when smoking, but rather, it systematically dismantles the psychological craving and diminishes the reward or "buzz" typically received from the nicotine.22 Users report that the habitual desire to smoke simply falls away, with the urge becoming easily ignorable or entirely forgotten.22

Beyond nicotine, this mechanism of reward-pathway recalibration has shown profound efficacy in reducing cravings for other high-dopamine behaviors. Clinical reports and subjective experiences indicate that bupropion effectively mitigates the urge for binge eating, compulsive spending, and, in some experimental clinical contexts, it has been utilized to manage cravings associated with cocaine and methamphetamine dependence.26 By providing a steady baseline of dopamine, the brain is less desperate to seek out sharp, exogenous dopaminergic spikes.

Reversal of SSRI-Induced Sexual Dysfunction

A highly notable and celebrated subjective benefit of bupropion is its complete lack of sexual side effects. SSRIs are notorious for causing devastating sexual dysfunction, including anorgasmia, severely decreased libido, and erectile dysfunction, which frequently leads to patient non-compliance. Bupropion is completely devoid of these effects. In fact, it is frequently prescribed specifically to reverse the sexual dysfunction induced by concurrent SSRI therapy.14 Users routinely report a marked, sometimes dramatic increase in libido, heightened tactile sensitivity, and the restoration of sexual satisfaction shortly after initiating bupropion therapy or adding it as an adjunct to an existing SSRI regimen.22

Weight Loss and Metabolic Enhancement

Unlike serotonergic agents, which are frequently linked to weight gain and carbohydrate cravings, bupropion is associated with weight neutrality and, quite often, clinically significant weight loss.40 By elevating dopamine and norepinephrine, bupropion modulates the hypothalamic appetite centers, effectively lowering hunger signals and promoting early satiety.40 Furthermore, the increased sympathetic nervous activity nudges the resting metabolic rate upward, creating a mild thermogenic effect that favors fat loss.42

Subjectively, users frequently report a total loss of interest in food, describing a phenomenon where they must consciously remind themselves to eat, as the biological drive of hunger is profoundly suppressed.20 While highly beneficial for obesity treatment—especially when combined with naltrexone in the formulation Contrave, which further blocks opioid-mediated food rewards—this intense appetite suppression requires monitoring to prevent unhealthy caloric deficits in vulnerable patients.3

The "Honeymoon Phase" and Long-Term Trajectory

A widely reported, almost universal phenomenon among bupropion users is the "honeymoon phase." This period, typically spanning the first one to two weeks of treatment, is characterized by intense physical energy, profound mood elevation, mild euphoria, extreme sociability, and what feels like an absolute remission of all depressive or ADHD symptoms.21 During this phase, the sudden, unaccustomed influx of dopamine and norepinephrine closely mimics a low-grade stimulant high, occasionally bordering on hypomania.43

However, this phase is invariably transient. The human brain is highly adaptive; as it detects the sustained, artificial elevation of these neurotransmitters, robust homeostatic mechanisms engage. This leads to the systematic downregulation of postsynaptic dopamine receptors.44

Subjectively, users often feel a sense of profound disappointment as the honeymoon phase ends. They frequently report that the medication has "stopped working," as the initial euphoric rush fades into a normalized, baseline state.44 This plateau is a critical, highly misunderstood juncture in bupropion therapy. While the overt, recreational-style stimulation subsides, the clinical antidepressant and anti-craving effects are typically sustained.40

If users or clinicians mistakenly attempt to chase the initial euphoria by prematurely escalating the dose from 150 mg to 300 mg or 450 mg, it rarely recaptures the magic. Instead, it leads to severe anxiety, intractable insomnia, emotional blunting, and an unacceptably increased risk of seizures.21 Successful long-term management requires accepting the plateau, recognizing that a constant state of euphoria is not the clinical goal, and utilizing the stabilized, underlying energy to implement permanent behavioral and lifestyle changes.40

Subjective Side Effects and Adverse Reactions

While bupropion elegantly sidesteps many of the adverse effects associated with serotonergic drugs, its adrenergic and dopaminergic nature introduces a distinct, often highly uncomfortable profile of adverse reactions.

Anxiety, Agitation, and the Sympathetic Overdrive

The most frequently cited limiting factor for bupropion therapy is its propensity to induce, unmask, or severely exacerbate anxiety.12 The sustained increase in norepinephrine tone can lock the user into a persistent "fight or flight" physiological state.33 Users report profound jitteriness, a racing heart (tachycardia), hypervigilance, and a creeping sense of impending doom or panic.39 For individuals whose depression is secondary to, or comorbid with, a primary anxiety disorder, bupropion can make their psychiatric presentation significantly worse.31

Emotional Dysregulation and Anger

Paradoxically for an antidepressant, bupropion can induce severe emotional dysregulation in susceptible individuals. Subjective reports heavily detail the sudden onset of abrupt anger loops, extreme irritability, a "short fuse," and uncontrollable bouts of crying over minor inconveniences.21 Users describe feeling highly agitated, easily provoked, and possessing intrusive thoughts of frustration.47

Conversely, some users note a shift toward profound emotional blunting or coldness. In these cases, empathy is drastically diminished, the individual becomes hyper-logical, and social interactions feel mechanical and devoid of warmth.19 Furthermore, in patients with undiagnosed or underlying bipolar spectrum disorders, bupropion carries a significant risk of inducing true manic or hypomanic episodes, characterized by racing thoughts, reckless behavior, decreased need for sleep, and grandiosity.18

Cognitive Deficits: Brain Fog and Aphasia

A lesser-known but highly distressing side effect reported by a specific subset of users is the induction of severe cognitive deficits, particularly regarding working memory and verbal recall.48 Despite its use as an ADHD medication, some users report that bupropion drastically impairs their ability to find the right words during conversation, leading to a form of expressive aphasia.48 Users describe feeling as though their IQ has dropped, experiencing profound brain fog, and struggling to articulate complex thoughts—a side effect that can be devastating for individuals in high-communication professions, such as sales or teaching.48 These cognitive impairments typically resolve fully upon discontinuation of the medication.48

Physical Side Effects: Insomnia, Tinnitus, and Hyperhidrosis

The peripheral sympathetic activation caused by bupropion leads to several pervasive physical side effects:

• Insomnia: Occurring in up to 40% of patients, the stimulating nature of the drug makes falling and staying asleep incredibly difficult. This is especially true if extended-release (XL) formulations are taken too late in the day, or if the dosage is too high.14
• Tinnitus: A frequently reported, highly distressing side effect is a constant, high-pitched ringing in the ears. In some alarming community reports, users state that this drug-induced tinnitus persists permanently, long after the medication has been discontinued.18
• Tremors and Sweating: Fine motor tremors in the hands, muscle tension, jaw clenching, and excessive hyperhidrosis (sweating) are common, reflecting a state of sympathetic nervous system overdrive.14
• Gastrointestinal and Sensory Issues: Severe dry mouth (xerostomia), constipation, acid reflux (GERD), and changes in the sense of taste are frequently reported during the initial weeks of treatment.1

Dream Potentiation and Sleep Architecture

Bupropion has a profound, highly specific impact on sleep architecture and the nature of dreaming. Users report wild, incredibly vivid, realistic, and highly immersive dreams. These dreams often diverge from the abstract nature of normal dreaming, taking on linear, adventure-like narratives that feel fully real to the dreamer.22

Due to the drug's nAChR antagonism and high norepinephrine activity, the recall of these dreams upon waking is significantly enhanced.22 However, this potentiation is a double-edged sword; it can easily cross into the territory of vivid night terrors. Users frequently report waking up feeling entirely exhausted, as if time had expanded and they had lived for days or weeks within the stressful dream state, completely negating the restorative purpose of sleep.22

Toxicity, High-Dose Effects, and Pharmacological Delirium

Bupropion possesses an incredibly narrow therapeutic index regarding neurological toxicity. Dosages exceeding the recommended 450 mg per day radically alter the drug's safety profile, shifting it from a therapeutic agent to a dangerous neurotoxin.14

Dose-Dependent Seizures

The absolute hallmark of bupropion toxicity is the induction of generalized tonic-clonic (grand mal) seizures.9 Bupropion lowers the seizure threshold in a strictly dose-dependent manner. At therapeutic doses of the immediate-release (IR) formulation (up to 450 mg daily), the seizure incidence is roughly 0.4%.23 However, when dosages climb to between 600 mg and 900 mg, the risk increases almost tenfold to an alarming 2.8%.23

The sustained-release (SR) and extended-release (XL) formulations were specifically engineered by pharmaceutical companies to blunt the peak plasma concentrations of the drug, which successfully reduced the seizure incidence to approximately 0.1% at the target dose of 300 mg.23 In overdose scenarios—where the median ingested dose associated with seizures is 4.4 grams—seizures are nearly guaranteed.7 Overdose literature indicates that 68% to 77% of bupropion-induced seizures occur within 4 hours of ingestion for IR formulations, but onset can be dangerously delayed up to 24 hours in patients who ingest extended-release preparations, requiring prolonged medical observation.7

Anticholinergic Delirium and Hallucinosis

At toxic, heavy, or massive recreational doses, bupropion’s non-competitive antagonism of nicotinic acetylcholine receptors (nAChRs) becomes highly pronounced. This induces a state of true pharmacological delirium.22

Unlike the delirium induced by classic anticholinergics (such as diphenhydramine/Benadryl or datura)—which is often accompanied by heavy physical sedation and lethargy—bupropion delirium is uniquely distressing and physically dangerous. The profound NDRI activity keeps the user forcefully awake, highly stimulated, and physically agitated while their mind completely fragments.22

Cognitive effects at this toxic stage include extreme paranoia, violent disinhibition, and a complete loss of touch with reality (delusions).22 Visual and auditory hallucinations manifest intensely. Users report terrifying external hallucinations such as seeing "shadow people," environments drifting or melting, enhanced pattern recognition, and persistent visual tracers.22 Auditory hallucinations are common, where sounds become physically painful or manifest as non-existent voices conversing with the user.22 Tactile hallucinations, such as formication (the sensation of insects crawling on or under the skin), are also prevalent, closely mimicking the amphetamine psychosis seen in severe methamphetamine toxicity.22 This state is physically exhausting, mentally terrifying, and requires immediate emergency medical intervention, usually involving high doses of intravenous benzodiazepines (e.g., lorazepam) to manage the agitation and prevent status epilepticus.7

Cardiovascular and Systemic Toxicity

Massive overdoses do not only target the brain; they can lead to life-threatening cardiovascular emergencies. Sinus tachycardia is nearly universal in overdose. However, severe toxicity can induce widening of the QRS complex, profound QTc prolongation, ventricular dysrhythmias, cardiogenic shock, and ultimately, cardiac arrest.5 Case reports have also documented severe secondary complications resulting from the extreme physiological stress of the overdose, such as delayed rhabdomyolysis (muscle breakdown leading to kidney failure) and permanent hypoxic encephalopathy following bupropion-induced status epilepticus.5

Alternative Routes of Administration and Abuse Potential

Despite its clinical classification as a relatively safe antidepressant with a low theoretical abuse liability, bupropion's chemical identity as a synthetic cathinone has led to widespread, highly dangerous misuse. This phenomenon is particularly prevalent in environments where traditional illicit stimulants are inaccessible, such as within correctional facilities, leading to its moniker as the "poor man's cocaine".2

Insufflation (Intranasal) Abuse

Crushing and snorting bupropion pills—referred to on the street, in internet forums, and in prisons by slang terms such as "welbys," "wellies," "dubs," or "barnies"—is the most common method of misuse.2 Because it is a cheap, unscheduled prescription drug, massive quantities can be acquired for very little money (e.g., 30 pills for $100), making it an attractive target for desperate users.54

Mechanism and Effects: By bypassing the gastrointestinal tract and avoiding first-pass hepatic metabolism entirely, insufflation delivers the parent drug directly across the highly vascularized nasal mucosa and into the systemic circulation.9 This extremely rapid absorption results in a sudden, massive spike in DAT transporter occupancy in the brain—achieving the 50% occupancy threshold required for drug reinforcement and reward conditioning.26 Unlike oral administration, which is slow and provides no discernible "rush," insufflation yields an immediate, intense euphoria and a powerful stimulant high. Users directly compare this sensation to cocaine or amphetamine, albeit often reported as slightly less intense, shorter-lived, and noticeably "dirtier".7

Severe Physical Toll and Risks: The physical damage caused by insufflating bupropion is immense. The tablets are not designed for mucosal absorption; they contain caustic binders, fillers, and the chemical itself is highly irritating. Users universally report an excruciating, blinding burning sensation upon insufflation, frequently likened to the pain of "snorting glass".29 Chronic insufflation rapidly leads to severe damage to the delicate nasal membranes, chronic epistaxis (nosebleeds), throat damage, and eventual septal perforation.27 In extreme cases, inhaling the powder into the lungs has resulted in diffuse alveolar hemorrhage, a life-threatening condition requiring intensive care and high-dose corticosteroid treatment.57

Furthermore, insufflation carries an exceptionally high, unpredictable risk of inducing sudden seizures and extreme tachycardia.9 Crushing the pill destroys any sustained-release properties, hitting the brain with an immediate toxic dose. Toxicological data reveals that seizures frequently occur within 15 minutes to 8 hours post-insufflation, often without any prodromal warning signs, making it a highly dangerous and potentially lethal recreational practice.9

Intravenous (IV) Injection

Intravenous injection of bupropion represents the absolute most hazardous route of abuse. When users attempt to crush the pills, dissolve them in water, and inject the resulting slurry, they introduce a host of insoluble binders, wax matrices, and fillers directly into their bloodstream.2

Consequences: The effects are physically devastating. IV bupropion abuse is closely associated with severe vascular complications. The caustic nature of the drug and the physical blockage caused by the fillers lead to venous insufficiency, arterial occlusion, severe tissue ischemia, and localized necrosis (the literal death of tissue cells at the injection site).2 Furthermore, it carries an imminent risk of systemic infection, massive abscess formation, and immediate, catastrophic cardiac arrest or refractory status epilepticus.5

Sublingual (SL) Administration

Though less common than insufflation, sublingual administration involves placing crushed pieces of the tablet under the tongue and allowing them to dissolve.60 Similar to intranasal use, this route bypasses first-pass hepatic metabolism, allowing the drug to enter the bloodstream directly through the sublingual mucosal tissues.62

Case reports describe users taking fractions of a tablet (e.g., 50 mg) sublingually to achieve brief, 3-to-4-hour windows of euphoria, extreme sociability, and disinhibition.62 Users report using this method specifically to overcome social anxiety in specific situations.62 However, this method carries the exact same unpredictability regarding massive plasma concentration spikes, rapidly leading to severe palpitations, hypertension, and highly elevated seizure risks.62

Sub-Therapeutic Dosing and the "Microdosing" Phenomenon

An emerging, highly discussed trend among patients who are exceptionally sensitive to psychotropic medications is the intentional use of sub-therapeutic doses, colloquially referred to within community forums as "microdosing".19 The standard clinical floor for bupropion is generally considered to be 150 mg XL or 100 mg SR.4 However, for a subset of individuals, these starting doses provoke intolerable anxiety, hyper-stimulation, emotional blunting, or severe insomnia, leading to rapid discontinuation of the drug.

Methodology: Because sustained and extended-release matrices (SR and XL) rely on specialized physical coatings and chemical matrices to control the slow release of the drug, they cannot be split, cut, or crushed without entirely destroying the release mechanism and risking a sudden, toxic overdose.9 Therefore, sub-therapeutic dosing is exclusively achieved by splitting Immediate Release (IR) tablets (e.g., carefully cutting a 75 mg IR or 100 mg IR pill into halves or quarters) or by utilizing specialized compounding pharmacies to create custom low-dose capsules.20

Subjective Utility and Benefits: Users employing daily doses ranging from 25 mg to 75 mg report that these specific "microdoses" provide sufficient dopaminergic and noradrenergic support to gently lift brain fog, increase baseline physical energy, and stabilize mood.19 Crucially, they achieve these benefits without triggering the intense peripheral nervous system activation that causes the sweating, severe tremors, and panic attacks seen at the 150 mg or 300 mg levels.19

For some individuals dealing with mild ADHD or persistent anger rumination, a sub-75 mg dose acts as a subtle emotional buffer. It effectively breaks the loop of irritability and frustration while allowing the patient to maintain their core personality, entirely avoiding the mechanical, emotional blunting and aphasia that they experienced at higher therapeutic doses.19

Critical Interactions and Contraindications

Bupropion interacts dangerously with several specific substances and physiological conditions, requiring strict clinical vigilance.

Alcohol, Benzodiazepines, and the Seizure Threshold

The interaction between bupropion and alcohol is particularly hazardous and highly deceptive. Alcohol is a central nervous system depressant, while bupropion acts as a stimulant.65 Combining them masks the subjective intoxicating effects of the alcohol, leading to impaired judgment and dangerous overconsumption, as the user does not feel as drunk as they actually are.65

More critically, bupropion inherently lowers the seizure threshold. If an individual with a history of heavy alcohol or benzodiazepine use suddenly ceases or drastically reduces their consumption while taking bupropion, the resulting physiological withdrawal further drastically lowers the seizure threshold. This creates a "perfect storm" for grand mal seizures and status epilepticus.11 Users who mix the two substances frequently report experiencing sudden, severe "blackouts" (anterograde amnesia, where periods of time are completely lost), extreme vertigo, and rapid onset of severe nausea and vomiting.65 Sudden cessation of alcohol while on this drug can be fatal.65

Monoamine Oxidase Inhibitors (MAOIs)

Bupropion is strictly and universally contraindicated with all Monoamine Oxidase Inhibitors (MAOIs), such as phenelzine, selegiline, isocarboxazid, and linezolid.17 Co-administration completely prevents the enzymatic breakdown of the artificially elevated dopamine and norepinephrine. This synergy leads to a catastrophic hypertensive crisis, sudden high body temperature, severe convulsions, and potential death. A strict minimum 14-day washout period is absolutely required when switching a patient between bupropion and any MAOI.4

The Daily Comedown, Long-Term Withdrawal, and Discontinuation

The temporal dynamics of bupropion dictate that users must manage both daily fluctuations in plasma levels and the eventual discontinuation of the drug.

The Daily "Crash"

Similar to amphetamine-based ADHD medications, users of immediate-release (IR) and sustained-release (SR) bupropion often experience a distinct, highly noticeable "crash" as the drug's plasma levels rapidly drop in the late afternoon or evening.27 This offset period is marked by sudden, profound physical fatigue, a return of mental fog, and a sharp, unpredictable spike in irritability, sadness, or anxiety.19 The transition from a highly stimulated, dopaminergic state back to baseline can cause temporary but severe dysphoria. This daily roller-coaster is precisely why formulations like Wellbutrin XL (extended-release) were developed—to smooth out the pharmacokinetic curve and provide a gentle, imperceptible 24-hour taper that prevents the afternoon crash.14

The Withdrawal Timeline

When long-term bupropion therapy is discontinued, users may experience a distinct withdrawal phase. Because bupropion does not influence serotonin, users rarely experience the severe, debilitating "brain zaps" (electrical shock sensations), profound vertigo, or severe flu-like symptoms universally associated with SSRI/SNRI discontinuation (e.g., coming off venlafaxine or paroxetine).6 However, the sudden absence of dopamine and norepinephrine reuptake inhibition leaves the central nervous system temporarily depleted, and the brain requires time to upregulate its receptor sensitivities back to baseline.67

• Days 1 to 3: Because the drug and its active metabolites possess such long half-lives (up to 37 hours), it takes several days for the systemic load to clear. Initial symptoms emerge very subtly. Users report the creeping onset of physical lethargy, returning brain fog, and a general feeling of being emotionally flat or unmotivated.6
• Days 4 to 7 (The Peak Phase): This is when withdrawal symptoms reach their maximum intensity. The subjective emotional experience is characterized by intense irritability, volatile mood swings, unpredictable bouts of anger, and heightened rebound anxiety.51 Physical symptoms may mirror a mild viral illness, including dull, persistent headaches, muscle aches, excessive sweating, and mild chills.51 Sleep architecture becomes highly disrupted; users may experience severe rebound insomnia, or conversely, excessive hypersomnia accompanied by incredibly vivid, exhausting dreams.67
• Weeks 2 to 4 (Resolution): Physical symptoms such as headaches and sweating rapidly dissipate. Cognitive and emotional symptoms, such as anhedonia, irritability, and poor concentration, slowly resolve as endogenous dopamine and norepinephrine levels stabilize.51 By day 28, the vast majority of users report that withdrawal symptoms have entirely ceased.68

Differentiating Withdrawal from Relapse

A significant clinical challenge during the discontinuation of bupropion is distinguishing between temporary withdrawal symptoms and a genuine relapse of the underlying psychiatric condition.6

Withdrawal symptoms are acute, feature physical manifestations (such as dizziness, headaches, flu-like aches, and sudden sweating), and follow a specific chronological curve—peaking within the first 4 to 7 days before gradually and consistently subsiding.67 They are a physiological reaction to the absence of the chemical.

Conversely, if symptoms such as profound anhedonia, deep depression, crippling fatigue, or severe ADHD manifestations slowly build over several weeks, do not feature the physical hallmarks of withdrawal, and remain static or worsen beyond the one-month mark, it strongly indicates a relapse of the baseline pathology. This requires the patient and clinician to reevaluate the treatment plan and potentially reinstate pharmacological support.6

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