Maximum Recommended Dosing and Safety Guidelines for Bupropion

Maximum Dosing Limits

The overall upper limit for bupropion (Wellbutrin) is 450 mg per day; doses above this markedly increase seizure risk. 1, 2, 3
Wellbutrin SR: recommended maximum 400 mg/day (200 mg twice daily); some guidelines allow 450 mg/day as an absolute ceiling. 1, 2, 3
Wellbutrin XL: recommended maximum 450 mg/day; the usual regimen is 300 mg once daily, with 450 mg as the ceiling. 1, 2, 3
For smoking‑cessation therapy, the maximum dose is 300 mg/day. 4, 5
For obesity treatment (bupropion combined with naltrexone), the maximum bupropion dose is 360 mg/day. 6, 7, 8

In moderate to severe renal impairment, the bupropion dose should be reduced to 150 mg once daily. 7
In moderate to severe hepatic impairment, the dose should be reduced to 150 mg once daily or every other day. 7
For elderly patients, initiation should be at ≈50 % of the adult dose. 10

When a patient does not respond to the maximum approved dose (450 mg/day), clinicians should switch to a different antidepressant class rather than exceed the dose limit. 9, 10
Prior to dose escalation, clinicians should re‑evaluate the diagnosis and ensure an adequate therapeutic trial of 6–8 weeks has been completed. 9, 10

Do not combine multiple bupropion formulations (e.g., IR + SR + XL) because this can unintentionally exceed the safe daily limit. 11
Do not prescribe bupropion to patients with seizure‑risk factors such as eating disorders, brain metastases, prior stroke, or alcohol‑withdrawal syndrome. 4, 5