Maximum Recommended Daily Dose of Bupropion (Wellbutrin)
The maximum recommended daily dose of bupropion is 450 mg per day, regardless of formulation (immediate-release, sustained-release, or extended-release). 1, 2, 3, 4
Dosing by Formulation
Immediate-Release (IR)
- Maximum: 450 mg/day divided into 3 doses
- Individual doses should not exceed 150 mg
- Allow at least 6 hours between doses
Sustained-Release (SR) - Wellbutrin SR
- Maximum: 400 mg/day divided into 2 doses 3
- Individual doses should not exceed 200 mg
- Allow at least 8 hours between doses
- Standard maintenance: 150 mg twice daily 2, 3
Extended-Release (XL) - Wellbutrin XL
Critical Safety Considerations
Seizure Risk
The seizure risk is dose-dependent and represents the most important safety concern with bupropion. 1
- At doses ≤450 mg/day: seizure incidence is 0.35%-0.48% 5, 6
- At doses >450 mg/day: seizure risk increases substantially 5
- Never exceed 450 mg/day to maintain seizure risk at approximately 0.1% 7
Absolute Contraindications for Bupropion Use
- Active seizure disorder or history of seizures 1
- Brain metastases or stroke 1
- Eating disorders (bulimia or anorexia nervosa) 1
- Concurrent MAO inhibitor use 1
- Abrupt discontinuation of alcohol or benzodiazepines
Dose Adjustments for Special Populations
Renal Impairment
- Reduce dose and/or frequency in patients with GFR <90 mL/min 4
- Bupropion and metabolites accumulate with renal dysfunction
- Monitor closely for adverse effects
Hepatic Impairment
- Moderate to severe (Child-Pugh 7-15): Maximum 150 mg every other day 4
- Mild (Child-Pugh 5-6): Consider dose reduction and/or decreased frequency 4
Elderly Patients
- Consider starting at approximately 50% of standard adult dose 3
- Elderly patients more likely to have decreased renal function requiring dose adjustment 4
Context-Specific Dosing
For Smoking Cessation
- Maximum: 300 mg/day (150 mg twice daily) 1, 2
- Initiate 1-2 weeks prior to quit date
- Days 1-3: 150 mg once daily
- Day 4 onward: 150 mg twice daily if tolerated
For Weight Management (Naltrexone-Bupropion ER/Contrave)
- Maximum: 360 mg bupropion/day (as 2 tablets twice daily, each containing 90 mg bupropion) 8, 9
- This is a fixed-dose combination product with specific titration schedule
- Titrate weekly over 4 weeks to maintenance dose
For Depression
- Maximum: 450 mg/day 10, 3, 4
- Standard maintenance: 300-450 mg/day
- Efficacy demonstrated at 450 mg/day in clinical trials 4
Important Clinical Pitfalls
Do not give the second daily dose late in the day to minimize insomnia risk 8. For twice-daily dosing, the second dose should be taken before 3 PM 10.
Never crush, chew, or divide extended-release formulations, as this can lead to rapid release and increased seizure risk.
Screen all patients for seizure risk factors before prescribing, including history of head trauma, CNS tumor, excessive alcohol use, or concomitant medications that lower seizure threshold.