BuPROPion (Systemic)
Drug class: Antineoplastic Agents
Usage of BuPROPion (Systemic)
Major Depressive Disorder
Treatment of major depressive disorder as defined by the Diagnostic and Statistical Manual (DSM).
May be useful (alone or in combination with other antidepressants) in patients with refractory depression.
Recommended as an option for first-line pharmacologic therapy for most patients with major depressive disorder according to clinical guidelines from the American Psychiatric Association (APA).
Seasonal Affective Disorder
Extended-release tablets (Wellbutrin XL, Aplenzin) used for prevention of seasonal major depressive episodes in patients with a diagnosis of seasonal affective disorder (SAD).
Smoking Cessation
Extended-release (SR) 150-mg tablets used as an adjunct in the cessation of smoking (alone or in combination with nicotine replacement therapy).
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.
Depression Associated with Bipolar Disorder
Treatment of patients with bipolar depression† [off-label] (bipolar disorder, depressive episode).
APA considers bupropion one of several second-line agents for use when first-line agents are ineffective or not tolerated.
Attention Deficit Hyperactivity Disorder (ADHD)
Used in a limited number of children and adults in the management of ADHD† [off-label].
Panic Disorder
Ineffective in the treatment of panic disorder and concomitant phobic disorder† [off-label], but may improve symptoms of panic and depression in patients with major depression who have superimposed panic symptoms.
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How to use BuPROPion (Systemic)
General
Pretreatment Screening
Patient Monitoring
Administration
Oral Administration
Administer orally with or without food.
Conventional Bupropion Hydrochloride TabletsInitially, administer orally twice daily in the morning and evening, then increase to 3 times daily, with ≥6 hours separating doses.
Dosages ≥300 mg should be administered as divided doses ≤150 mg per dose.
Avoid bedtime administration of evening dose to decrease incidence of insomnia.
Do not chew, divide, or crush tablets; swallow tablets whole.
Extended-release TabletsSustained-release (SR), film-coated bupropion hydrochloride tablets (e.g., Wellbutrin SR): Initially, administer orally once daily in the morning, then increase to twice daily, in the morning and evening. Dosages >150 mg should be administered as divided doses twice daily, with ≥8 hours separating the doses. Avoid bedtime administration of evening dose to decrease incidence of insomnia.
Extended-release (SR) bupropion hydrochloride tablets: Administer orally once daily for the first 3 days, then usually increase to twice daily administration with ≥8 hours separating the doses. Avoid bedtime administration of evening dose to decrease incidence of insomnia.
Extended-release bupropion hydrobromide (Aplenzin) or bupropion hydrochloride (Wellbutrin XL) tablets: Administer orally once daily in the morning.
Extended-release bupropion hydrochloride 450-mg film-coated tablets (Forfivo XL): Administer orally once daily. If insomnia occurs, avoid administration close to bedtime.
Do not chew, divide, or crush extended-release tablets; tablets should be swallowed whole.
The shell of some extended-release tablets (e.g., Aplenzin, Wellbutrin XL) does not dissolve and may be passed in the stool.
Dosage
Available as bupropion hydrochloride or bupropion hydrobromide; dosage expressed in terms of the salt.
Bupropion hydrobromide doses of 174, 348, or 522 mg are equivalent to bupropion hydrochloride doses of 150, 300, or 450 mg, respectively.
Pediatric Patients
ADHD† [off-label] Bupropion Hydrochloride OralChildren weighing ≥20 kg: Initially, 1 mg/kg daily in 2–3 divided doses. 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.
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).
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.
Adults
Major DepressionIncrease bupropion dosage gradually; avoid exceeding recommended maximum individual doses or daily dosages to minimize risk of seizures.
Optimum duration of treatment not established; however, acute depressive episodes thought to require several months or longer of sustained antidepressant therapy. Some clinicians recommend that long-term antidepressant therapy be considered in certain patients at risk for recurrence of depressive episodes (e.g., those with highly recurrent unipolar depression).
Unknown whether dosage required to induce remission is identical to dosage needed to maintain and/or sustain euthymia.
Antidepressant efficacy of bupropion hydrochloride extended-release, film-coated tablets (Wellbutrin SR) shown to be maintained for periods of up to 44 weeks in patients receiving 150 mg twice daily.
Efficacy of bupropion hydrochloride conventional tablets beyond 6 weeks not established systematically in controlled studies.
Periodically reevaluate usefulness and appropriate dosage of drug in patients receiving prolonged therapy with conventional or extended-release tablets.
Therapy with Conventional Bupropion Hydrochloride Tablets OralInitially, 100 mg twice daily. Alternatively, dosage may be initiated at 75 mg 3 times daily.
To minimize risk of seizures, do not increase dosage by >100 mg daily every 3 days.
If clinical improvement not apparent after >3 days, may increase to 100 mg 3 times daily.
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 a maximum of 150 mg 3 times daily.
Therapy with Extended-release Bupropion Hydrochloride Tablets OralExtended-release, film-coated tablets (e.g., Wellbutrin SR): Initially, 150 mg once daily in the morning. If tolerated, may increase to target dosage of 150 mg twice daily (with ≥8 hours between doses) as early as fourth day of therapy. Dosages >300 mg daily should not be considered until completion of several weeks of therapy; then, if no apparent improvement, may increase dosage to maximum of 200 mg twice daily (with ≥8 hours between doses).
Extended-release tablets (Wellbutrin XL): Initially, 150 mg once daily. If tolerated, may increase to target dosage of 300 mg once daily after 4 days of therapy.
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.
Extended-release 450-mg tablets (Forfivo XL) in patients who have received bupropion hydrochloride 300 mg daily for ≥2 weeks and require a dosage of 450 mg daily, or in patients currently receiving bupropion hydrochloride 450 mg daily: 450 mg once daily.
When discontinuing therapy with Forfivo XL, use another bupropion formulation to taper the dose prior to discontinuance of bupropion.
Therapy with Extended-release Bupropion Hydrobromide Tablets OralExtended-release tablets (e.g., Aplenzin): Initially, 174 mg once daily in the morning. After 4 days of dosing, may increase to target dosage of 348 mg once daily in the morning.
When discontinuing therapy in patients receiving 348 mg once daily, taper dosage to 174 mg once daily prior to discontinuance.
Seasonal Affective Disorder Therapy with Extended-release Bupropion Hydrochloride 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. Individualize timing of initiation and duration of therapy based on patient’s historical pattern of seasonal depressive episodes.
Initially, 150 mg once daily in the morning. If tolerated, increase dosage after 7 days to target dosage of 300 mg once daily.
For patients receiving 300 mg once daily during the autumn-winter period, taper dosage to 150 mg once daily prior to discontinuance.
Therapy with Extended-release Bupropion Hydrobromide Tablets OralExtended-release tablets (Aplenzin): Initiate therapy in autumn prior to onset of depressive symptoms; continue treatment through the winter and taper and discontinue in early spring. Individualize timing of initiation and duration of therapy based on patient’s historic pattern of seasonal depressive episodes.
Initially, 174 mg once daily. After 7 days of dosing, may increase to target dose of 348 mg once daily in the morning.
For patients receiving 348 mg once daily during the autumn-winter period, taper dosage to 174 mg once daily prior to discontinuance.
Smoking Cessation Therapy with Extended-release (SR) Bupropion Hydrochloride Tablets OralInitially, 150 mg daily for the first 3 days of therapy. Initiate 1–2 weeks prior to discontinuance of cigarette smoking.
Maintenance, 150 mg twice daily (with ≥8 hours between doses). Continue therapy for 7–12 weeks; evaluate need for prolonged therapy after that period based on individual patient assessment.
Cessation of smoking is unlikely in patients who do not show substantial progress toward abstinence after 7 weeks of therapy, so such therapy generally should be discontinued at that time in these patients.
Combination Therapy with Extended-release Bupropion Hydrochloride Tablets and Transdermal Nicotine Patches OralInitially, 150 mg daily, and after 3 days increase to 150 mg twice daily (with ≥8 hours between doses) while still smoking.
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.
Taper transdermal nicotine to 14, then to 7 mg/24 hours during the eighth and ninth weeks of therapy, respectively.
Depression Associated With Bipolar Disorder† [off-label] Bupropion Hydrochloride OralDosages generally range from 75–400 mg in conjunction with a mood-stabilizing agent (e.g., Carbamazepine, lithium, valproate).
ADHD† Therapy with Conventional Bupropion Hydrochloride Tablets OralInitially, 150 mg daily. May be titrated up to 450 mg daily.
Therapy with Extended-release Bupropion Hydrochloride Tablets Oral150–450 mg daily.
Prescribing Limits
Adults
Major Depression OralConventional bupropion hydrochloride tablets: Maximum 450 mg daily (not >150 mg per dose).
Extended-release, film-coated bupropion hydrochloride tablets (e.g., Wellbutrin SR): Maximum 400 mg daily (not >200 mg per dose).
Extended-release bupropion hydrochloride tablets (Wellbutrin XL): Maximum 300 mg daily.
Extended-release, 450-mg bupropion hydrochloride tablets (Forfivo XL): Maximum 450 mg daily.
Extended-release bupropion hydrobromide tablets (Aplenzin): Maximum 522 mg daily.
Seasonal Affective Disorder OralExtended-release bupropion hydrochloride tablets (e.g., Wellbutrin XL): Dosages >300 mg daily not studied.
Smoking Cessation OralExtended-release (SR) bupropion hydrochloride tablets: 300 mg daily (not >150 mg per dose).
Special Populations
Hepatic Impairment
Maximum Dosage for Major Depression and Seasonal Affective Disorder in Moderate to Severe Hepatic Impairment (Child-Pugh score: 7–15)1142168Dosage Form
Maximum Dosage
Conventional bupropion hydrochloride tablets
75 mg once daily
Extended-release, film-coated bupropion hydrochloride tablets (e.g., Wellbutrin SR)
100 mg once daily or 150 mg every other day
Extended-release bupropion hydrochloride tablets (Wellbutrin XL)
150 mg every other day
Extended-release bupropion hydrobromide tablets (Aplenzin)
174 mg every other day
Smoking cessation in patients with severe hepatic cirrhosis: Maximum 150 mg every other day as extended-release (SR) tablets .
Major depression, seasonal affective disorder, or smoking cessation in patients with mild hepatic impairment (Child-Pugh score: 5–6): Reduce dosage and/or frequency of administration as required.
Bupropion hydrochloride extended-release, 450-mg tablets (Forfivo XL) are not recommended for use in patients with hepatic impairment.
Renal Impairment
Active metabolites may accumulate; reduce dosage and/or frequency of administration as required.
Smoking cessation in patients undergoing hemodialysis: Some clinicians recommend a dosage of 150 mg every 3 days as extended-release, film-coated bupropion hydrochloride tablets.
Bupropion hydrochloride extended-release, 450-mg tablets (Forfivo XL) are not recommended for use in patients with renal impairment.
Warnings
Contraindications
Warnings/Precautions
Warnings
Suicidal Thoughts and Behaviors in Children, Adolescents, and Young AdultsPossible 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. Suicide is a known risk of depression and certain other psychiatric disorders, and these disorders themselves are the strongest predictors of suicide.
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.
Anxiety, agitation, panic attacks, insomnia, irritability, hostility, aggressiveness, impulsivity, akathisia, hypomania, and/or mania may be precursors to emerging suicidality. 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.
Prescribe in smallest quantity consistent with good patient management to reduce risk of overdosage.
Observe these precautions for patients with psychiatric (e.g., major depressive disorder, obsessive-compulsive disorder) or nonpsychiatric disorders.
Sensitivity Reactions
Hypersensitivity ReactionsAnaphylactoid/anaphylactic reactions (e.g., pruritus, urticaria, angioedema, dyspnea) reported; may require medical treatment. Postmarketing reports include erythema multiforme, Stevens-Johnson syndrome, and anaphylactic shock.
Possible arthralgia, myalgia, and fever with rash and other symptoms suggestive of delayed hypersensitivity.
Advise patients to discontinue bupropion and contact their clinician if symptoms of a possible hypersensitivity reaction occur.
General Precautions
Neuropsychiatric Symptoms and Suicidality in Smoking Cessation TreatmentSerious 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.
Additional analyses and studies, including a large randomized controlled study in >8000 patients, indicate that risk is lower than previously thought and comparable to nicotine replacement therapy or placebo. 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.
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.
Monitor patients for neuropsychiatric symptoms or for worsening of preexisting psychiatric conditions. 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. Provide ongoing monitoring and supportive care until symptoms resolve.
SeizuresDose-related increase in risk of seizures reported; increase dose gradually and avoid exceeding recommended daily and single doses. Do not exceed a total daily dosage of 450 mg (as 150 mg 3 times daily) of bupropion hydrochloride as conventional tablets; 400 mg daily (as 200 mg twice daily) of bupropion hydrochloride as extended-release, film-coated tablets (e.g., Wellbutrin SR); 300 mg daily (as 150 mg twice daily) of bupropion hydrochloride as extended-release (SR) tablets for smoking cessation; 300 mg once daily of bupropion hydrochloride as extended-release tablets (e.g., Wellbutrin XL); 450 mg once daily of bupropion hydrochloride as extended-release, 450-mg tablets (Forfivo XL); or 522 mg once daily of bupropion hydrobromide as extended-release tablets (Aplenzin).
Drug is contraindicated in patients with a seizure disorder, anorexia nervosa or bulimia, or undergoing abrupt discontinuation of alcohol, benzodiazepines, barbiturates, or antiepileptic drugs.
Risk factors also include patient-related factors (e.g., history of severe head trauma, arteriovenous malformation, CNS tumor, CNS infection, severe stroke), clinical situations (excessive use of alcohol, benzodiazepines, sedative hypnotic agents, or opiates; use of anorectics; use of illicit drugs [e.g., cocaine]; abuse or misuse of prescription drugs [e.g., CNS stimulants]; metabolic disorders [e.g., hypoglycemia, hyponatremia, severe hepatic impairment, hypoxia]; diabetes treated with oral hypoglycemics or insulin), and concomitant drugs that lower seizure threshold (e.g., other bupropion-containing drugs, antipsychotics, tricyclic antidepressants, theophylline, systemic corticosteroids).
If patients experience a seizure during therapy, discontinue drug and do not restart.
HypertensionHypertension (sometimes severe) has occurred with bupropion therapy either alone or in combination with transdermal nicotine in patients with and without preexisting hypertension. Risk of hypertension is increased with concomitant use of MAO inhibitors (contraindicated) or other dopaminergic or noradrenergic drugs; also increased with concomitant transdermal nicotine therapy.
Safety in patients with recent history of MI or unstable heart disease not established.
Assess BP before initiating bupropion and monitor periodically during therapy, especially in patients receiving concomitant nicotine replacement therapy.
Activation of Mania or HypomaniaPossible precipitation of manic, mixed, or hypomanic manic episodes; risk appears increased in patients with bipolar disorder or who have risk factors for bipolar disorder.
Bupropion is not FDA-labeled for use in treating bipolar depression. Screen for history of bipolar disorder and risk factors for bipolar disorder (e.g., family history of suicide, bipolar disorder, depression) prior to initiating therapy.
Psychosis and Other Neuropsychiatric Effects in Patients Treated for DepressionNeuropsychiatric manifestations, including confusion, delusions, hallucinations, psychosis, disturbances in concentration, and paranoia, reported in patients receiving bupropion in depression trials. Some of these patients had a diagnosis of bipolar disorder. In some cases, symptoms diminished with dosage reduction or withdrawal of therapy. Similar types of neuropsychiatric manifestations reported during postmarketing experience in patients receiving the drug for smoking cessation.
Advise patients to contact a clinician if adverse neuropsychiatric effects occur. Discontinue bupropion extended-release tablets (e.g., Wellbutrin XL, Forfivo XL, Aplenzin) if such reactions occur.
Angle-closure GlaucomaPupillary dilation (mydriasis) occurs with many antidepressants, including bupropion, and may trigger an acute attack of angle-closure glaucoma (narrow-angle glaucoma) in patients with anatomically narrow angles who do not have a patent iridectomy.
Laboratory Test InterferencesFalse-positive results for urine immunoassay screening tests for amphetamines reported in patients receiving bupropion and following discontinuance of drug. Confirmatory tests (e.g., gas chromatography/mass spectrometry) can distinguish bupropion from amphetamines.
Specific Populations
PregnancyData from epidemiologic studies have not shown an overall increased risk for congenital malformations with bupropion. International bupropion pregnancy registry was not designed or powered to evaluate specific defects; however, possible increase in cardiac malformations identified.
National Pregnancy Registry for Antidepressants at 844-405-6185 or [Web].
Consider the risks to the mother of untreated depression and potential effects on the fetus when discontinuing or changing treatment with antidepressant medications during pregnancy and postpartum.
Encourage pregnant smokers to attempt cessation using educational and behavioral interventions before using drug approaches. Use bupropion extended-release (SR) tablets during pregnancy only if potential benefit justifies potential risk to the fetus.
LactationDistributed into milk. Effects of bupropion or its metabolites on milk production not known.
Limited data from postmarketing reports of bupropion use in nursing women have not identified a clear association of adverse reactions in the breast-fed infant. Postmarketing reports of seizures in breast-fed infants; however, causal relationship not established.
Pediatric UseSafety and efficacy not established in children <18 years of age.
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). However, a later 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. No suicides occurred in these pediatric trials.
Carefully consider these findings when assessing potential benefits and risks of bupropion in a child or adolescent for any clinical use.
Has been used in a limited number of children 7–16 years of age for attention deficit disorder† without unusual adverse effect.
Geriatric UseNo substantial differences in safety and efficacy relative to younger adults; however, possibility of increased sensitivity to drug in some older patients cannot be ruled out.
Consider increased possibility of impaired renal function, which may increase risk of adverse effects, when selecting dosage; may be useful to monitor renal function.
In pooled data analyses, a reduced risk of suicidality was observed in adults ≥65 years of age with antidepressant therapy compared with placebo.
Hepatic ImpairmentReduced dosage required in patients with severe hepatic impairment (Child-Pugh score: 7–15). In patients with mild hepatic impairment (Child-Pugh score: 5–6), consider reduced frequency and/or dosage.
Use of bupropion hydrochloride extended-release, 450-mg tablets (Forfivo XL) not recommended in patients with hepatic impairment.
Renal ImpairmentUse with caution; parent drug and active metabolites may accumulate. Monitor closely for adverse effects that could indicate high bupropion or metabolite exposures; reduction in dosage and/or frequency may be necessary.
Use of bupropion hydrochloride extended-release, 450-mg tablets (Forfivo XL) not recommended in patients with renal impairment.
Common Adverse Effects
Common adverse effects (≥5%) in patients receiving conventional bupropion hydrochloride tablets: Agitation, dry mouth, constipation, headache/migraine, nausea/vomiting, dizziness, excessive sweating, tremor, insomnia, blurred vision, tachycardia, confusion, rash, hostility, cardiac arrhythmias, auditory disturbance.
Common adverse effects (≥5%) in patients receiving bupropion hydrochloride extended-release, film-coated tablets (e.g., Wellbutrin SR): Headache, dry mouth, nausea, insomnia, dizziness, pharyngitis, constipation, agitation, anxiety, abdominal pain, tinnitus, tremor, palpitation, myalgia, sweating, rash, anorexia.
Common adverse effects (≥5%) in patients receiving bupropion hydrochloride extended-release (SR) tablets for smoking cessation: Insomnia, rhinitis, dry mouth, dizziness, nervous disturbance, anxiety, nausea, constipation, arthralgia.
Common adverse effects (≥5%) in patients receiving bupropion hydrochloride extended-release tablets (e.g., Wellbutrin XL, Forfivo XL ): Dry mouth, nausea, insomnia, dizziness, pharyngitis, abdominal pain, agitation, anxiety, tremor, palpitation, sweating, tinnitus, myalgia, anorexia, urinary frequency, rash.
Common adverse effects (≥5%) in patients receiving bupropion hydrobromide extended-release tablets (e.g., Aplenzin) include dry mouth, nausea, insomnia, dizziness, pharyngitis, abdominal pain, agitation, anxiety, tremor, palpitation, sweating, tinnitus, myalgia, anorexia, urinary frequency, rash.
What other drugs will affect BuPROPion (Systemic)
Metabolized to hydroxybupropion, principally by CYP2B6; CYP isoenzymes not involved in the formation of other bupropion metabolites.
Bupropion and its metabolites inhibit CYP2D6.
Drugs Affecting Hepatic Microsomal Enzymes
Potential pharmacokinetic interaction (altered serum concentrations of bupropion) with drugs that induce or inhibit CYP2B6.
Drugs Metabolized by Hepatic Microsomal Enzymes
Substrates of CYP2D6: Potential pharmacokinetic interaction (increased plasma substrate concentrations). Dosage reduction of the CYP2D6 substrate may be necessary, particularly for drugs with a narrow therapeutic index.
Prodrugs dependent on CYP2D6 for activation: Possible reduced clinical efficacy of the prodrug. An increase in dosage of the prodrug may be necessary.
Smoking Cessation
Smoking may induce enzymes and increase metabolism of some drugs. 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, insulin); consider dosage adjustment.
Specific Drugs
Drug
Interaction
Comments
Alcohol
Possible neuropsychiatric effects or reduced alcohol tolerance
Minimize or avoid alcohol consumption
Amantadine
Potential increased incidence of adverse CNS effects (e.g., restlessness, agitation, tremor, ataxia, gait disturbance, vertigo, dizziness)
Use concomitantly with caution
Antiarrhythmic agents, class 1C (e.g., flecainide, propafenone)
Possible decreased metabolism of antiarrhythmic agent
Use with caution; consider dosage reduction of antiarrhythmic agent
Antidepressants
Possible lowering of seizure threshold; increased risk of seizures
Use with extreme caution; initiate therapy with lower dosages of bupropion and increase gradually
Antidepressants, SSRIs (e.g., fluoxetine, fluvoxamine, paroxetine, sertraline)
Possible decreased metabolism of SSRI
Possible decreased metabolism of bupropion
Use with caution; consider dosage reduction of SSRI
Antidepressants, tricyclic (TCAs) (e.g., desipramine, imipramine, nortriptyline)
Possible decreased TCA metabolism
Use with caution; consider dosage reduction of TCA
Antipsychotic agents (e.g., haloperidol, risperidone, thioridazine)
Possible lowering of seizure threshold; increased risk of seizures
Possible decreased metabolism of antipsychotic
Use with extreme caution; initiate therapy with lower dosages of bupropion and increase gradually
Use with caution; consider dosage reduction of antipsychotic agent
β-Adrenergic blocking agents (e.g., metoprolol)
Possible decreased metabolism of β-blocker
Use with caution; consider dosage reduction of β-blocker
Benzodiazepines
Increased risk of seizures with excessive use or abrupt discontinuance
Use with extreme caution; initiate therapy with lower dosages of bupropion and increase gradually
Carbamazepine
Possible increased metabolism of bupropion
Increase in bupropion dosage may be necessary; do not exceed maximum recommended bupropion dosage
Cimetidine
Possible decreased metabolism of bupropion
Use with caution
Corticosteroids (systemic)
Possible lowering of seizure threshold; increased risk of seizures
Use with extreme caution; initiate therapy with lower dosages and increase gradually
Digoxin
Possible decreased digoxin concentrations
Monitor plasma digoxin concentrations
Efavirenz
Possible decreased bupropion exposure; hydroxybupropion exposure unchanged but peak concentration increased
Increase in bupropion dosage may be necessary; do not exceed maximum recommended bupropion dosage
Levodopa
Potential increased incidence of adverse CNS effects (e.g., restlessness, agitation, tremor, ataxia, gait disturbance, vertigo, dizziness)
Use concomitantly with caution
Lopinavir
Possible decreased bupropion and hydroxybupropion exposure
Increase in bupropion dosage may be necessary; do not exceed maximum recommended dosage
MAO inhibitors (e.g., phenelzine)
Possible enhanced acute toxicity of bupropion; increased risk of hypertensive reactions
Concomitant use is contraindicated; ≥14 days should elapse between discontinuation of an MAO inhibitor and initiation of treatment with bupropion or between discontinuation of bupropion and initiation of an MAO inhibitor
MAO inhibitors, reversible (e.g., linezolid, IV methylene blue)
Possible increased risk of hypertensive reactions
Do not initiate reversible MAO inhibitors in patients receiving bupropion
If urgent treatment with a reversible MAO inhibitor is necessary (alternatives not available and possible benefits outweigh risks), discontinue bupropion prior to administering reversible MAO inhibitor; then, monitor patient for 2 weeks or until 24 hours after last dose of reversible MAO inhibitor; may resume bupropion 24 hours after last dose of reversible MAO inhibitor
Nelfinavir
Possible decreased metabolism of bupropion
Nicotine
Possible increased risk of hypertension
Monitor BP
Phenobarbital
Possible increased metabolism of bupropion
Increase in bupropion dosage may be necessary; do not exceed maximum recommended dosage
Phenytoin
Possible increased metabolism of bupropion
Increase in bupropion dosage may be necessary; do not exceed maximum recommended dosage
Platelet-aggregation inhibitors (e.g., clopidogrel, prasugrel, ticlopidine)
Potential pharmacokinetic interaction (may increase bupropion exposure but decrease hydroxybupropion exposure)
Adjust bupropion dosage if necessary based on clinical response
Ritonavir
Possible decreased bupropion and hydroxybupropion exposure
Increase in bupropion dosage may be necessary; do not exceed maximum recommended dosage
Tamoxifen
Possible reduced efficacy of tamoxifen
Increased dosage of tamoxifen may be necessary
Theophylline
Possible lowering of seizure threshold; increased risk of seizures
Use with extreme caution; initiate therapy with lower bupropion dosage and increase gradually
Venlafaxine
Possible decreased metabolism of venlafaxine
Decrease dosage of venlafaxine if necessary
Warfarin
Possible altered PT/INR; infrequently associated with hemorrhagic or thrombotic complications
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