Class: Antidepressants, Miscellaneous
- Smoking Deterrents
- Deterrents, Smoking
VA Class: CN609
Chemical Name: ±-1-(3-Chlorophenyl)-2-[(1,1-dimethylethyl)amino]-1-propanone Hydrochloride
Molecular Formula: C13H18ClNO•ClH
CAS Number: 31677-93-7
Brands: Wellbutrin, Zyban
Medically reviewed by Drugs.com. Last updated on Jan 27, 2020.
Warning
- Clinical Worsening and Suicide Risk in Treating Psychiatric Disorders
-
Antidepressants may increase risk of suicidal thinking and behavior (suicidality) in children, adolescents, and young adults (18–24 years of age) with major depressive disorder and other psychiatric disorders; balance this risk with clinical need.1 142 143 161 162 168 Bupropion is not approved for use in pediatric patients.1 142 143 168 (See Pediatric Use under Cautions.)
-
In pooled data analyses, risk of suicidality was not increased in adults >24 years of age and apparently was reduced in adults ≥65 years of age with antidepressant therapy compared with placebo.161 162
-
Depression and certain other psychiatric disorders are themselves associated with an increased risk of suicide.161 162 167
-
Appropriately monitor and closely observe all patients who are started on bupropion therapy for clinical worsening, suicidality, or unusual changes in behavior; involve family members and/or caregivers in this process.1 142 143 162 161 167 168 (See Clinical Worsening and Suicide Risk in Treating Psychiatric Disorders under Cautions.)
Introduction
Antidepressant and smoking deterrent; aminoketone derivative.1 43 142 143 168
Uses for buPROPion
Major Depressive Disorder
Treatment of major depressive disorder.1 127 128 129 131 132 142 168 179 180
May be useful (alone or in combination with other antidepressants) in patients with refractory depression.179 180
Seasonal Affective Disorder
Prevention of seasonal major depressive episodes in patients with a diagnosis of seasonal affective disorder (SAD; also referred to as winter depression).168 169 170 171
Smoking Cessation
Adjunct in the cessation of smoking (alone or in combination with nicotine replacement therapy).143 145 146 147 152 (See Hypertension under Cautions and also see Smoking Cessation and Specific Drugs under Interactions.)
US Public Health Service (USPHS) guideline for the treatment of tobacco use and dependence recommends bupropion (as extended-release tablets) as one of several first-line drugs that may reliably increase long-term smoking abstinence rates.152 For additional information, consult the most current USPHS clinical practice guideline available at [Web]
Depression Associated with Bipolar Disorder
Treatment of patients with bipolar depression† (bipolar disorder, depressive episode).2 77 78 85 86 102 154
American Psychiatric Association (APA) considers bupropion one of several second-line agents for use when first-line agents are ineffective or not tolerated.154
Attention Deficit Hyperactivity Disorder (ADHD)
Used in a limited number of children2 44 79 80 134 156 157 158 and adults in the management of ADHD†.2 44 76 126
Panic Disorder
Ineffective in the treatment of panic disorder and concomitant phobic disorder†,2 44 99 134 but may improve symptoms of panic and depression in patients with major depression who have superimposed panic symptoms.44
Bulimia Nervosa
Not recommended by APA for bulimia nervosa† because associated with seizures in purging bulimic patients.153
buPROPion Dosage and Administration
General
-
Appropriately monitor and closely observe all patients receiving bupropion for any indication for clinical worsening, suicidality, or unusual changes in behavior, particularly during initial therapy or following any change (increase or decrease) in dosage.161 162 167 182 183 184 (See Clinical Worsening and Suicide Risk in Treating Psychiatric Disorders in Boxed Warning and also under Cautions.)
-
Monitor all patients receiving bupropion for smoking cessation for serious neuropsychiatric symptoms or worsening of preexisting psychiatric illness.182 183 184 185 186 187 (See Neuropsychiatric Symptoms and Suicidality in Smoking Cessation Treatment under Cautions.)
Major Depressive Disorder
-
Increase dosages gradually to minimize the risk of seizures and other adverse effects; do not exceed recommended maximum individual doses or daily dosages.1 142 168 (See Prescribing Limits under Dosage and Administration and also see Seizures under Cautions.)
-
Maximum antidepressant effects of therapy may not be evident until ≥4 weeks of treatment.1 142 168
Administration
Oral Administration
Conventional Tablets
Initially, administer orally twice daily in the morning and evening, then increase to 3 times daily, preferably with 6 or more hours separating doses (e.g., in the morning, at midday, and in the evening).1 23 24 141
Dosages ≥300 mg should be administered as divided doses that do not exceed 150 mg per dose.1 If components of a larger dosage include 4 whole tablets of 100 mg each, administer the divided doses 4 times daily separated by 4 or more hours so that no individual dose exceeds 150 mg.1
Avoid bedtime administration of evening dose to decrease incidence of insomnia.1 142
Extended-release Tablets
Extended-release, film-coated tablets (e.g., Wellbutrin SR): Initially, administer orally once daily in the morning, then increase to twice daily, in the morning and evening.142 Dosages >150 mg should be administered as divided doses twice daily, preferably with 8 or more hours separating the doses.142 143 Avoid bedtime administration of evening dose to decrease incidence of insomnia.183
Extended-release, film-coated tablets (e.g., Zyban): Administer orally once daily for the first 3 days, then usually increase to twice daily administration with 8 or more hours separating the doses.143 Avoid bedtime administration of evening dose to decrease incidence of insomnia.182
Extended-release tablets (Wellbutrin XL): Administer orally once daily in the morning, with an interval of 24 hours separating the doses.168
Do not chew, divide, or crush the extended-release tablets (e.g., Zyban, Wellbutrin SR, Wellbutrin XL); tablets should be swallowed whole.142 143 168
The shell of the extended-release tablet (Wellbutrin XL) does not dissolve and may be passed in the stool.168
Dosage
Available as bupropion hydrochloride; dosage expressed in terms of the salt.1
Pediatric Patients
ADHD†
Oral
Children weighing ≥20 kg: Initially, 1 mg/kg daily in 2–3 divided doses.156 After 3 days, titrate up to 3 mg/kg daily in 2–3 divided doses by day 7, then up to 6 mg/kg daily in 2–3 divided doses or 300 mg (whichever is smaller) by third week of therapy.156
Alternatively, may give initial dose of 37.5 or 50 mg twice daily with titration over 2 weeks up to a maximum of 250 mg daily (300–400 mg daily in adolescents).157
Pediatric dosage for ADHD generally has ranged from 50–100 mg 3 times daily for conventional tablets or 100–150 mg twice daily for extended-release tablets.158
Adults
Major Depression
Therapy with Conventional Tablets
OralInitially, 100 mg twice daily.1 Alternatively, dosage may be initiated at 75 mg 3 times daily.23 24 141
If clinical improvement not apparent after >3 days, may increase to 100 mg 3 times daily.1 23 24 141 142
Dosages >300 mg should not be considered until completion of several weeks of therapy; if no improvement is apparent, then the dosage may be increased to 150 mg 3 times daily.1 142 Dosage should not be increased by more than 100 mg every 3 days.1 23 24 141 142
If no improvement after appropriate trial at 450 mg daily, the drug should be discontinued.1 23 24 141
Therapy with Extended-release Tablets
OralExtended-release, film-coated tablets (e.g., Wellbutrin SR): Initially, 150 mg once daily in the morning.142 If tolerated, may increase to 150 mg twice daily as early as fourth day of therapy.142 Dosages >300 mg daily should not be considered until completion of several weeks of therapy; then, if no apparent improvement, may increase dosage to 200 mg twice daily.1 142
Extended-release tablets (Wellbutrin XL): Initially, 150 mg once daily.168 If tolerated, may increase to 300 mg once daily as early as fourth day of therapy.168 Dosages >300 mg should not be considered until completion of several weeks of therapy; then, if no apparent improvement, may increase dosage to 450 mg once daily.168
When switching from conventional or extended-release, film-coated tablets (e.g., Wellbutrin SR) to extended-release tablets (Wellbutrin XL), administer same total daily dose when possible.168
Seasonal Affective Disorder
Therapy with Extended-release Tablets
OralExtended-release tablets (Wellbutrin XL): Initiate therapy in autumn prior to onset of depressive symptoms; continue treatment through the winter and taper and discontinue in early spring.168 169 Individualize timing of initiation and duration of therapy based on patient’s historical pattern of seasonal depressive episodes.168
Initially, 150 mg once daily in the morning.168 If tolerated, may increase dosage after 1 week to 300 mg once daily.168 If this dosage is not tolerated, reduce dosage to 150 mg once daily.168
Usual target dosage: 300 mg once daily in the morning.168
For patients receiving 300 mg once daily during the autumn-winter period, taper dosage to 150 mg once daily for 2 weeks prior to discontinuance.168
Smoking Cessation
Therapy with Extended-release, Film-coated Tablets
OralInitially, 150 mg daily for the first 3 days of therapy.143 145 Initiate 1–2 weeks prior to discontinuance of cigarette smoking.143 145
Maintenance, 150 mg twice daily.143 145 Continue therapy for 7–12 weeks; evaluate need for prolonged therapy after that period based on individual patient assessment.143
Cessation of smoking is unlikely in patients who do not show substantial progress toward abstinence after 7 weeks of therapy, so such therapy should be discontinued at that time in these patients.143
Combination Therapy with Extended-release Tablets and Transdermal Nicotine Patches
OralInitially, 150 mg daily, and after 3 days increase to 150 mg twice daily while still smoking.143
After about 1 week of therapy, when the patient is scheduled to stop smoking, initiate transdermal nicotine therapy at a dosage of 21 mg/24 hours.143
Taper transdermal nicotine to 14, then to 7 mg/24 hours during the eighth and ninth weeks of therapy, respectively.143
Depression Associated With Bipolar Disorder†
Oral
Dosages generally range from 75–400 mg in conjunction with a mood-stabilizing agent (e.g., carbamazepine, lithium, valproate).2
ADHD†
Therapy with Conventional Tablets
OralInitially, 150 mg daily.2 May be titrated up to 450 mg daily.2
Prescribing Limits
Adults
Major Depression
Oral
Conventional tablets: Maximum 450 mg daily (not >150 mg per dose).1
Extended-release, film-coated tablets (e.g., Wellbutrin SR): Maximum 400 mg daily (not >200 mg per dose).142
Extended-release tablets (Wellbutrin XL): Maximum 450 mg daily.168
Seasonal Affective Disorder
Oral
Extended-release tablets (e.g., Wellbutrin XL): Dosages >300 mg daily have not been studied.168
Smoking Cessation
Oral
Extended-release, film-coated tablets (e.g., Zyban): 300 mg daily (not >150 mg per dose).143
Special Populations
Hepatic Impairment
Dosage Form |
Maximum Dosage |
---|---|
Conventional tablets |
75 mg once daily1 |
Extended-release, film-coated tablets (e.g., Wellbutrin SR) |
100 mg once daily or 150 mg every other day142 |
Extended-release tablets (Wellbutrin XL) |
150 mg every other day168 |
Smoking cessation in patients with severe hepatic cirrhosis: Maximum 150 mg every other day as extended-release, film-coated tablets (e.g., Zyban).143
Major depression, seasonal affective disorder, or smoking cessation in patients with mild to moderate hepatic impairment (e.g., mild to moderate hepatic cirrhosis): Reduce dosage and/or frequency of administration as required.1 142 143 168 (See Hepatic Impairment under Cautions.)
Renal Impairment
Active metabolites may accumulate; reduce dosage and/or frequency of administration as required.1 142 143 168 177 (See Renal Impairment under Cautions.)
Smoking cessation in patients undergoing hemodialysis: Some clinicians recommend a dosage of 150 mg every 3 days as extended-release, film-coated tablets (e.g., Zyban).177
Cautions for buPROPion
Contraindications
-
Current or past diagnosis of anorexia nervosa or bulimia.1 21 22 24 39 142 143 168
-
Contraindicated in patients receiving any other bupropion formulation (e.g., for smoking cessation, antidepressant use) because risk of seizures is dose-dependent.1 142 143 168
-
Patients undergoing abrupt discontinuance of alcohol or sedatives (including benzodiazepines).1 142 143 168
-
Patients currently receiving, or having recently received (i.e., within 2 weeks), MAO inhibitor therapy.1 142 168
-
Hypersensitivity to the drug or any ingredient in the formulation.1 142 168
Warnings/Precautions
Warnings
Clinical Worsening and Suicide Risk in Treating Psychiatric Disorders
Possible worsening of depression and/or emergence of suicidal ideation and behavior (suicidality) or unusual changes in behavior in both adult and pediatric patients with major depressive disorder, whether or not they are taking antidepressants; may persist until clinically important remission occurs.1 142 143 161 162 167 168 181 However, suicide is a known risk of depression and certain other psychiatric disorders, and these disorders themselves are the strongest predictors of suicide.161 162 167
Appropriately monitor and closely observe patients receiving bupropion for any reason, particularly during initiation of therapy (i.e., the first few months) and during periods of dosage adjustments.1 142 143 161 162 167 168 (See Clinical Worsening and Suicide Risk in Treating Psychiatric Disorders in Boxed Warning and also see Pediatric Use under Cautions.)
Anxiety, agitation, panic attacks, insomnia, irritability, hostility, aggressiveness, impulsivity, akathisia, hypomania, and/or mania may be precursors to emerging suicidality.161 167 Consider changing or discontinuing therapy in patients whose depression is persistently worse or in those with emerging suicidality or symptoms that might be precursors to worsening depression or suicidality, particularly if severe, abrupt in onset, or not part of patient’s presenting symptoms.1 142 143 161 162 167 168 (See General under Dosage and Administration.)
Prescribe in smallest quantity consistent with good patient management to reduce risk of overdosage.1 142 143 168 161
Observe these precautions for patients with psychiatric (e.g., major depressive disorder, obsessive-compulsive disorder) or nonpsychiatric disorders.1 142 143 161 168
Sensitivity Reactions
Hypersensitivity Reactions
Anaphylactoid reactions (e.g., pruritus, urticaria, angioedema, dyspnea) have been reported;1 142 143 168 however, causality has not been established.145 Postmarketing reports include erythema multiforme, Stevens-Johnson syndrome, and anaphylactic shock.1 142 143 168
Possible arthralgia, myalgia, and fever with rash and other symptoms suggestive of delayed hypersensitivity.1 142 143 168
General Precautions
Neuropsychiatric Symptoms and Suicidality in Smoking Cessation Treatment
Serious neuropsychiatric symptoms, including mood changes (e.g., depression, mania), psychosis, hallucinations, paranoia, delusions, homicidal ideation, hostility, agitation, aggression, anxiety, and panic as well as suicidal ideation, suicide attempt, and completed suicide, reported in patients receiving bupropion or varenicline for smoking cessation; has occurred in patients with or without psychiatric history.182 183 184 185 186 187
Additional analyses and studies, including a large randomized controlled study in more than 8000 patients, indicate that risk is lower than previously thought and comparable to nicotine replacement therapy or placebo.224 225 However, there is evidence indicating patients with a preexisting psychiatric illness (e.g., depression, anxiety disorder, schizophrenia) may be more likely to experience such events.224
Although risk remains, particularly in individuals with current or past psychiatric illnesses, patients generally do not experience serious consequences (e.g., hospitalization); therefore, benefits of smoking cessation (e.g., reduced risk of developing pulmonary disease, cardiovascular disease, and cancer) continue to outweigh risks of these cessation drugs.224
Monitor patients for neuropsychiatric symptoms or for worsening of preexisting psychiatric conditions.182 183 184 185 Discontinue bupropion in patients who develop agitation, hostility, depressed mood, or changes in behavior or thinking that are not typical for the patient or who develop suicidal ideation or suicidal behavior.182 183 184 185 Provide ongoing monitoring and supportive care until symptoms resolve.182 183 184 185 186
Seizures
Seizures reported;1 6 19 20 24 52 142 143 168 risk of seizures may be higher with sudden and large increases in dosage.1 8 (See Dosage and Administration.)
Risk factors include patient factors (e.g., history of head trauma or prior seizure, CNS tumor, presence of severe hepatic cirrhosis), clinical situations (excessive use of alcohol or sedatives [e.g., benzodiazepines]; abrupt withdrawal from alcohol or other sedatives; addiction to opiates, cocaine, or stimulants; use of OTC stimulants and anorectics; diabetes treated with oral hypoglycemics or insulin), and concomitant drugs that lower seizure threshold.1 8 142 143 168 (See Specific Drugs under Interactions.)
If patients experience a seizure during therapy, discontinue drug and do not restart.1 142 143 168
Neuropsychiatric Effects in Patients Treated for Depression
Neuropsychiatric manifestations, including confusion, delusions, hallucinations, psychosis, disturbances in concentration, and paranoia, reported in patients receiving bupropion in depression trials.182 183 184 185 In some cases, symptoms diminished with dosage reduction or withdrawal of therapy.182 Similar types of neuropsychiatric manifestations reported during postmarketing experience in patients receiving the drug for smoking cessation.182 183 (See Neuropsychiatric Symptoms and Suicidality in Smoking Cessation Treatment under Cautions.)
Activation of Mania or Psychosis
Possible activation of mania or hypomania in bipolar disorder patients; activation of latent psychosis may occur in susceptible patients.1 142 143 168
Bupropion is not FDA-labeled for use in treating bipolar depression.1 142 143 168 Screen for risk of bipolar disorder by obtaining detailed psychiatric history (e.g., family history of suicide, bipolar disorder, depression) prior to initiating therapy.1 142 143 161 168
Hypertension
Hypertension (sometimes severe) has occurred with bupropion therapy either alone or in combination with transdermal nicotine in patients with and without pre-existing hypertension.1 Safety in patients with recent history of MI or unstable heart disease not established.1 142 143 168
Specific Populations
Pregnancy
Category B.1 142 143 168 Bupropion pregnancy registry at 800-336-2176.1 142 143 168
Lactation
Distributed into milk; discontinue nursing or drug.1 2 64 142 143 168
Pediatric Use
Safety and efficacy not established in children <18 years of age.1 142 143 168
FDA warns that a greater risk of suicidal thinking or behavior (suicidality) occurred during first few months of antidepressant treatment compared with placebo in children and adolescents with major depressive disorder, obsessive-compulsive disorder (OCD), or other psychiatric disorders based on pooled analyses of 24 short-term, placebo-controlled trials of 9 antidepressant drugs (SSRIs and others).1 142 143 161 162 168 However, a more recent meta-analysis of 27 placebo-controlled trials of 9 antidepressants (SSRIs and others) in patients <19 years of age with major depressive disorder, OCD, or non-OCD anxiety disorders suggests that the benefits of antidepressant therapy in treating these conditions may outweigh the risks of suicidal behavior or suicidal ideation.181 No suicides occurred in these pediatric trials.1 142 143 161 162 168 181
Carefully consider these findings when assessing potential benefits and risks of bupropion in a child or adolescent for any clinical use.1 142 143 162 168 162 161 167 181 (See Clinical Worsening and Suicide Risk in Treating Psychiatric Disorders in Boxed Warning and also under Cautions.)
Has been used in a limited number of children 7–16 years of age for attention deficit disorder† without unusual adverse effect.2 44 79 80 134 158
Geriatric Use
Use with caution;1 possible decreased clearance.1 142 143 No substantial differences in safety and efficacy relative to younger adults.1 2 142 143 168
In pooled data analyses, a reduced risk of suicidality was observed in adults ≥65 years of age with antidepressant therapy compared with placebo.162 161 (See Clinical Worsening and Suicide Risk in Treating Psychiatric Disorders in Boxed Warning and also under Cautions.)
Hepatic Impairment
Use with extreme caution in patients with severe hepatic cirrhosis and caution in patients with hepatic impairment (e.g., mild to moderate hepatic cirrhosis); reduced frequency and/or dosage and close monitoring for adverse effects required.1 142 143 168 (See Hepatic Impairment under Dosage and Administration.)
Renal Impairment
Use with caution; active metabolites may accumulate.1 142 143 168 177 Monitor closely for adverse effects (e.g., seizures); reduction in dosage and/or frequency may be necessary.1 142 143 168 177
Common Adverse Effects
Agitation, dry mouth, insomnia, headache/migraine, nausea/vomiting, constipation, tremor.1 3 6 7 19 44 47 50 134 142 143 168
Interactions for buPROPion
Metabolized principally by CYP2B6; may also inhibit CYP2D6 and induce other hepatic microsomal enzymes.1 142 143 168
Drugs Affecting Hepatic Microsomal Enzymes
Potential pharmacokinetic interaction (altered serum concentrations of bupropion) with drugs that induce or inhibit CYP2B6.1 142 143 168
Drugs Metabolized by Hepatic Microsomal Enzymes
Substrates of CYP2D6: potential pharmacokinetic interaction (increased plasma substrate concentrations).1 142 143 168
Substrates of hepatic microsomal enzymes: potential pharmacokinetic interaction (altered substrate metabolism).1 142 143 168
Smoking Cessation
Smoking may induce enzymes and increase metabolism of some drugs.149 150 151 Therefore, cessation of smoking (with or without adjunctive use of bupropion) may result in decreased enzyme induction and altered metabolism of some drugs (e.g., theophylline, warfarin); consider dosage adjustment.143
Specific Drugs
Drug |
Interaction |
Comments |
---|---|---|
Alcohol |
Possible neuropsychiatric effects or reduced alcohol tolerance1 142 143 Possible increased risk of seizures with excessive use of alcohol or abrupt withdrawal from alcohol1 142 143 |
|
Amantadine |
Potential increased incidence of adverse effects (e.g., nausea/vomiting, excitement/restlessness, postural tremor)1 2 44 55 142 143 |
Use with caution; initiate bupropion therapy with lower dosage and increase gradually in small increments1 142 143 |
Antiarrhythmic agents, class 1C (e.g., flecainide, propafenone) |
Possible decreased metabolism of antiarrhythmic agent144 |
Use with caution;144 consider dosage reduction of antiarrhythmic agent1 142 |
Antidepressants |
Possible lowering of seizure threshold; increased risk of seizures1 142 143 |
Use with extreme caution; initiate therapy with lower dosages of bupropion and increase gradually1 142 143 |
Antidepressants, SSRIs (e.g., fluoxetine, fluvoxamine, paroxetine, sertraline) |
Possible decreased metabolism of SSRI1 142 143 144 168 Possible decreased metabolism of bupropion168 |
Use with caution;144 168 consider dosage reduction of SSRI1 142 168 |
Antidepressants, tricyclic (TCAs) (e.g., desipramine, imipramine, nortriptyline) |
Use with caution;144 168 consider dosage reduction of TCA1 142 168 |
|
Antipsychotic agents (e.g., haloperidol, risperidone, thioridazine) |
Possible lowering of seizure threshold; increased risk of seizures1 142 143 Possible decreased metabolism of antipsychotic144 |
Use with extreme caution; initiate therapy with lower dosages of bupropion and increase gradually1 142 143 Use with caution;144 consider dosage reduction of antipsychotic agent1 142 |
β-Adrenergic blocking agents (e.g., metoprolol) |
Possible decreased metabolism of β-blocker144 |
Use with caution;144 consider dosage reduction of β-blocker1 142 |
Benzodiazepines |
Increased risk of seizures with excessive use or abrupt discontinuance1 142 143 |
Use with extreme caution; initiate therapy with lower dosages of bupropion and increase gradually1 142 143 |
Carbamazepine |
||
Cimetidine |
||
Corticosteroids (systemic) |
Possible lowering of seizure threshold; increased risk of seizures1 142 143 |
Use with extreme caution; initiate therapy with lower dosages and increase gradually1 142 143 |
Cyclophosphamide |
||
Efavirenz |
||
Lamotrigine |
||
Levodopa |
Potential increased incidence of adverse effects (e.g., nausea/vomiting, excitement/restlessness, postural tremor)1 2 44 55 142 143 |
Use with caution; initiate therapy with lower bupropion dosage and increase gradually in small increments1 142 143 |
MAO inhibitors (e.g., phenelzine) |
Concurrent administration is contraindicated; at least 14 days should elapse between discontinuation of an MAO inhibitor and initiation of treatment with bupropion1 142 168 |
|
Nelfinavir |
||
Nicotine |
Possible increased risk of hypertension143 |
|
Orphenadrine |
||
Phenobarbital |
||
Phenytoin |
||
Ritonavir |
||
Theophylline |
Possible lowering of seizure threshold; increased risk of seizures1 142 143 |
Use with extreme caution; initiate therapy with lower bupropion dosage and increase gradually1 142 143 |
Thiotepa |
||
Warfarin |
Possible altered PT/INR; infrequently associated with hemorrhagic or thrombotic complications1 142 143 |
buPROPion Pharmacokinetics
Absorption
Bioavailability
Well-absorbed from the GI tract following oral administration.60 Peak plasma concentrations usually occur within 2, 3, or 5 hours after oral administration of conventional or extended-release tablets of Wellbutrin SR or Wellbutrin XL, respectively.1 59 61 90 130 142 143 168
At steady state, conventional and extended-release tablets (Wellbutrin SR, Wellbutrin XL) are essentially bioequivalent.142 168
Food
Food does not appear to substantially affect the peak plasma concentration or extent of absorption achieved with extended-release tablets.142 143 168
Distribution
Extent
Bupropion and its metabolites are distributed into milk.2 64
Plasma Protein Binding
≥80% bound to human albumin.1 142 143 168
Elimination
Metabolism
Extensively metabolized in the liver1 57 60 61 130 142 143 to 3 active metabolites: hydroxybupropion (principally by CYP2B6), threohydrobupropion, and erythrohydrobupropion.1 142 143 168
Elimination Route
Excreted in urine (87%) and feces (10%), principally as metabolites.1 61 130 142 143 168
Half-life
The half-life in the terminal phase (t½β) averages about 14 hours following single doses; 1 57 61 90 130 139 with multiple dosing, t½β reportedly averages 21 hours.139 142
Special Populations
Hepatic impairment can decrease elimination of the drug.143
Renal impairment may decrease elimination of major metabolites.1 142 143 168 177
Stability
Storage
Oral
Conventional Tablets
15–25°C; protect from light and moisture.1
Extended-release Tablets
Extended-release, film-coated tablets (e.g., Wellbutrin SR, Zyban): tight, light-resistant containers at 20–25°C.142 143
Extended-release tablets (Wellbutrin XL): tight, light-resistant containers at 25°C (may be exposed to temperatures ranging from 15–30°C).168
Actions
-
Chemically unrelated to tricyclic, tetracyclic, or other currently available antidepressants (e.g., SSRIs);1 43 142 143 168 also chemically unrelated to nicotine or other agents currently used in treatment of nicotine dependence.143
-
Mechanism of antidepressant action is unclear; noradrenergic pathways appear to be principally involved.1 2 115 142 168
-
Mechanism of action as an adjunct in the cessation of smoking is unclear; noradrenergic and/or dopaminergic effects presumably are involved.143 145 146
-
Produces less frequent anticholinergic effects, cardiovascular effects, antihistaminic effects, and weight gain compared with tricyclic antidepressants at usual dosages.2 23 44 104 127 128 133
Advice to Patients
-
Importance of providing copy of written patient information (medication guide) each time bupropion is dispensed.182 183 184 185
-
Risk of suicidality with antidepressants; importance of patients, families, and caregivers being alert to and immediately reporting emergence of suicidality, worsening depression, or unusual changes in behavior, especially during the first few months of therapy or during periods of dosage adjustment.1 142 143 167 168 162 161 167 Advise patients to read the medication guide explaining risks of suicidality before starting bupropion and each time the prescription is refilled.182 183 184 185
-
Risk of serious neuropsychiatric symptoms, including changes in mood (e.g., depression, mania), psychosis, hallucinations, paranoia, delusions, homicidal ideation, hostility, agitation, aggression, anxiety, and panic as well as suicidal ideation, suicide attempt, and completed suicide, when used for smoking cessation.182 183 184 185 186 187 Advise patients to read the medication guide explaining the risk of such symptoms before starting bupropion and each time the prescription is refilled.182 183 184 185
-
Importance of advising patients and caregivers that patients using bupropion for smoking cessation should stop drug and immediately contact clinician if agitation, depressed mood, or changes in behavior or thinking that are not typical for the patient are observed, or if the patient develops suicidal ideation or suicidal behavior.182 183 184 185
-
Importance of advising patients that it usually takes several weeks of antidepressant therapy before they will start to feel better.183 184 185 Advise patients not to stop taking the drug if a response is not evident right away.183 184 185
-
Importance of avoiding concurrent therapy with preparations containing bupropion for use as an adjunct in smoking cessation (e.g., Zyban) and preparations used for treatment of major depressive disorder or seasonal affective disorder (e.g., various Wellbutrin formulations and generic formulations).182 183 184 185
-
Importance of avoiding some activities (e.g., operating machinery, driving a motor vehicle) until the effects on the individual are known.1 142 143 168
-
Importance of minimizing or avoiding consumption of alcohol; use of alcohol or abrupt cessation of use may alter the seizure threshold.1 142 143 168
-
Risk of seizures, particularly in patients with certain medical problems, those taking certain drugs concomitantly, and those receiving higher dosages (see Seizures under Cautions).182 183 184 185 Advise patients to stop taking the drug and immediately notify their clinician if they have a seizure.182 183 184 185
-
Risk of anaphylactoid and other sensitivity reactions.182 183 184 185 Advise patients to stop taking bupropion and notify their clinician immediately if they develop signs of a severe allergic reaction (e.g., rash, itching, hives, fever, swollen lymph glands, painful sores in mouth or around eyes, swelling of lips or tongue, chest pain, difficulty breathing).182 183 184 185
-
Risk of high blood pressure, which can be severe.182 185 Risk may be higher during concurrent use of nicotine replacement therapy (e.g., nicotine patch) for smoking cessation.182 185
-
Importance of informing patients that the shell of the extended-release tablet (Wellbutrin XL) does not dissolve and may be passed in the stool.168
-
Importance of not crushing or chewing extended-release tablets.142 143 168
-
Importance of patients informing clinicians of existing or contemplated concomitant therapy, including prescription and OTC drugs, as well as concomitant illnesses.1 142 143 168
-
Importance of women notifying clinicians if they are or plan to become pregnant or plan to breast-feed.1 142 143 168
-
Importance of informing patients of other important precautionary information.1 142 143 168 (See Cautions.)
Preparations
Excipients in commercially available drug preparations may have clinically important effects in some individuals; consult specific product labeling for details.
Please refer to the ASHP Drug Shortages Resource Center for information on shortages of one or more of these preparations.
* available from one or more manufacturer, distributor, and/or repackager by generic (nonproprietary) name
Routes |
Dosage Forms |
Strengths |
Brand Names |
Manufacturer |
---|---|---|---|---|
Oral |
Tablets, extended-release |
150 mg* |
Wellbutrin XL |
GlaxoSmithKline |
300 mg* |
Wellbutrin XL |
GlaxoSmithKline |
||
Tablets, extended-release, film-coated |
100 mg* |
buPROPion Hydrochloride SR |
||
Wellbutrin SR |
GlaxoSmithKline |
|||
150 mg* |
buPROPion Hydrochloride SR |
|||
Wellbutrin SR |
GlaxoSmithKline |
|||
Zyban (available as 60-tablet Advantage Pack or refill) |
GlaxoSmithKline |
|||
200 mg* |
buPROPion Hydrochloride SR |
|||
Wellbutrin SR |
GlaxoSmithKline |
|||
Tablets, film-coated |
75 mg* |
buPROPion Hydrochloride |
||
Wellbutrin |
GlaxoSmithKline |
|||
100 mg* |
buPROPion Hydrochloride |
|||
Wellbutrin |
GlaxoSmithKline |
AHFS DI Essentials™. © Copyright 2021, Selected Revisions February 5, 2018. American Society of Health-System Pharmacists, Inc., 4500 East-West Highway, Suite 900, Bethesda, Maryland 20814.
† Use is not currently included in the labeling approved by the US Food and Drug Administration.
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