Bupropion and Buprenorphine: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jul 2, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Buprenorphine
Bupropion
How we grade severity & evidence
Severity levels
- Contraindicated: These should generally not be used together.
- Major: Potentially serious — often needs a change or close monitoring.
- Moderate: Can be significant — usually manageable with monitoring.
- Minor: Usually limited clinical impact.
Evidence grades
- Established: Well documented — supported by controlled studies or strong clinical data.
- Probable: Good supporting evidence, though not definitively proven.
- Suspected: Some evidence suggests this interaction, but it is not well established.
- Possible: Limited or conflicting evidence; the interaction may occur.
- Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.
Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.
You've been prescribed buprenorphine (a pain or opioid-treatment medicine) along with bupropion (Wellbutrin, used for depression or to help with quitting smoking). Here's the thing to know: bupropion can slightly lower the brain's seizure threshold, meaning it can make seizures a little more likely, especially at higher doses. Buprenorphine can also nudge that risk in the same direction, so taking both together may add up.
This concern is mostly theoretical, so please don't worry or stop anything on your own. Your care team knows how to handle it, usually by starting bupropion low, going up slowly, and keeping an eye on you. Just call them right away if you ever have a seizure.
Effect: Additive reduction of seizure threshold, increasing seizure risk with concomitant use.
Mechanism/direction: Pharmacodynamic (additive), not a metabolic PK interaction. BuPROPion carries a well-known dose-related seizure risk; buprenorphine may further lower the threshold, so combined use is additive.
Evidence: Theoretical. Onset: unspecified. Severity: major.
Management:
- Use with caution; initiate buPROPion at a low dose and titrate gradually.
- Respect maximum dosing: IR not to exceed 450 mg/day; SR not to exceed 400 mg/day; XL not to exceed 300 mg/day.
- Assess other threshold-lowering factors (other antidepressants, antipsychotics, theophylline, corticosteroids, alcohol/withdrawal).
- If a seizure occurs, discontinue buPROPion and do not reinitiate.
What happens
Increased risk of seizures
Interaction Deep Dive
The risk of seizures with buPROPion is dose-related, and this risk rises when it is given together with other agents that lower the seizure threshold. Exercise extreme caution when buPROPion is coadministered with medications known to lower the seizure threshold (for example, antipsychotics, antidepressants, theophylline, and systemic corticosteroids). Initiate therapy at a low buPROPion dose and titrate upward slowly. Should a seizure occur, stop buPROPion and do not restart it1. For tablets, the dose should not go above 450 mg/day 2. For the extended-release formulation, the dose should not surpass 300 mg once daily 3. For the sustained-release formulation, the dose should not exceed 400 mg/day 4.
Why it happens (mechanism)
Additive lowering of the seizure threshold
How to manage this interaction
Good news: this is a manageable combination, and many people take both safely. The key is keeping the seizure risk low.
- Keep taking both as prescribed unless your doctor tells you otherwise. Do not adjust doses on your own.
- Your team will typically start bupropion at a low dose and raise it slowly, staying within the safe daily maximum for your formulation.
- Tell your prescriber about anything else that can raise seizure risk (other antidepressants, antipsychotics, steroids, theophylline, or heavy alcohol use).
- Seek care immediately if you have a seizure. Bupropion would be stopped and not restarted.
Ask your pharmacist to review your full medication list to be safe.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Bupropion and Buprenorphine together?
Combining buprenorphine and bupropion can add up to a higher seizure risk, so your care team will start bupropion low, go slow, and stay within dose limits. Keep both as prescribed and get help right away if a seizure happens. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Bupropion and Buprenorphine interaction?
It is rated major. Potentially serious — often needs a change or close monitoring.
How quickly could this interaction happen?
The documented onset is "unspecified". The timing of this interaction is not well characterized.
How is the Bupropion and Buprenorphine interaction managed?
Good news: this is a manageable combination, and many people take both safely. The key is keeping the seizure risk low. Keep taking both as prescribed unless your doctor tells you otherwise. Do not adjust doses on your own. Your team will typically start bupropion at a low dose and raise it slowly, staying within the safe daily maximum for your formulation. Tell your prescriber about anything else… Management is individual — always follow your own care team's guidance.
How strong is the evidence for this interaction?
The evidence is graded "theoretical". Predicted from the drugs' pharmacology; not yet confirmed in people.
From our Q&A
Real reader questions about these medications, each personally answered by our pharmacist:
Questions for your pharmacist
- Does my dose of Bupropion or Buprenorphine need adjusting while I take them together?
- What symptoms should prompt me to call you or my prescriber right away?
- Does the timing of my doses matter for this combination?
- Is there a safer alternative to one of these medications for me?
References (4)
- Product Information: APLENZIN(R) oral extended-release tablets, bupropion hydrobromide oral extended-release tablets. Bausch Health US LLC (per FDA), Bridgewater, NJ, 2024. DailyMed
- Product Information: WELLBUTRIN(R) oral tablets, bupropion hydrochloride oral tablets. GlaxoSmithKline (per FDA), Durham, NC, 2024. DailyMed
- Product Information: WELLBUTRIN XL(R) oral extended-release tablets, bupropion hydrochloride oral extended-release tablets. Bausch Health US, LLC (per FDA), Bridgewater, NJ, 2024. DailyMed
- Product Information: WELLBUTRIN(R) SR oral sustained-release tablets, bupropion hydrochloride oral sustained-release tablets. GlaxoSmithKline (per FDA), Durham, NC, 2024. DailyMed
Keep reading about Buprenorphine
Keep reading about Bupropion
These medications also interact with supplements
Prescription drugs aren't the whole picture — herbal and dietary supplements can interact with them too. From the evidence-graded Natural Medicines database:
major · moderate · minor — check everything you take with our drug–supplement interaction checker.
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