What happens if you take dextromethorphan with Wellbutrin (bupropion)?
Dextromethorphan (a common cough suppressant) and Wellbutrin (bupropion, an antidepressant) can interact because both affect brain neurotransmitters. The most clinically important concern is that dextromethorphan is metabolized by the liver enzyme CYP2D6, and bupropion is a strong CYP2D6 inhibitor. That can raise dextromethorphan levels and increase the risk of side effects such as sedation, dizziness, confusion, and agitation. In some people, it can also increase the risk of serotonin-toxicity–type symptoms if other serotonergic drugs are involved.
If you’re asking because you’re already taking both, the practical next step is to avoid taking extra dextromethorphan products (including combination cold/flu medications) without your clinician’s guidance, and to seek care urgently for severe symptoms (for example: confusion, severe agitation, high fever, uncontrolled muscle jerks, or fainting).
Why does bupropion increase dextromethorphan effects?
Bupropion inhibits CYP2D6. Dextromethorphan depends on CYP2D6 for clearance, so blocking that pathway can prolong and intensify dextromethorphan’s effects in the body.
This means the interaction can be more significant than with dextromethorphan and many other antidepressants, and it can happen even at doses that might be tolerated without bupropion.
Is dextromethorphan ever allowed with Wellbutrin?
Some people may be advised that occasional, short-term use of dextromethorphan is acceptable, but that depends on your dose of Wellbutrin, other medications, your medical history, and the specific product strength.
Because the interaction is pharmacokinetic (bupropion raising dextromethorphan exposure), clinicians often recommend alternatives to dextromethorphan for cough suppression, especially if you take higher-dose Wellbutrin or have other risk factors.
What cough medicines are commonly used instead?
If dextromethorphan isn’t a good fit, clinicians may suggest other cough approaches depending on the cause of your cough (viral illness, post-nasal drip, allergies, asthma, reflux). Examples can include non-dextromethorphan options and treatment targeted to the cause (like antihistamines for post-nasal drip, acid-reflux management for GERD, or inhalers for bronchospasm). The right substitute depends on why you’re coughing.
What side effects should you watch for?
Stop and get urgent medical help if you notice symptoms consistent with a serious reaction, such as:
- severe agitation or confusion
- hallucinations
- high fever
- tremor or muscle stiffness with poor coordination
- fainting
Call your prescriber promptly for less severe but concerning effects such as marked sedation, dizziness, or feeling “out of it.”
What I need from you to answer more precisely
To give a safer, more tailored answer, tell me:
1) Your Wellbutrin dose (and whether it’s SR/XL/IR)
2) The dextromethorphan product name and dose (including how often)
3) Any other meds you’re taking (especially SSRIs/SNRIs, MAOIs, tramadol, linezolid, triptans, or other cold/flu products)
Sources: None provided.