Drug interactions
Nefazodone + Trimipramine
Severity: Major
Nefazodone and Trimipramine: major interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Nefazodone inhibits CYP3A4 and serotonin reuptake and may raise trimipramine levels, increasing anticholinergic and cardiac toxicity. Serotonin syndrome is also possible.
What this interaction means in plain words
Nefazodone and Trimipramine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
CYP3A4 inhibition by nefazodone plus additive serotonergic activity.
What to do
Avoid if possible. If combined, use reduced trimipramine doses and monitor for serotonin toxicity, ECG changes and anticholinergic effects.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Trimipramine
- Disopyramide + Trimipramine Contraindicated
- Dofetilide + Trimipramine Contraindicated
- Ibutilide + Trimipramine Contraindicated
- Isocarboxazid + Trimipramine Contraindicated
- Pentamidine + Trimipramine Contraindicated
- Phenelzine + Trimipramine Contraindicated
Frequently asked questions
Can I take Nefazodone with Trimipramine?
MediHelp rates the interaction as major. Nefazodone and Trimipramine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Nefazodone inhibits CYP3A4 and serotonin reuptake and may raise trimipramine levels, increasing anticholinergic and cardiac toxicity. Serotonin syndrome is also possible.
How serious is the interaction between Nefazodone and Trimipramine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid if possible. If combined, use reduced trimipramine doses and monitor for serotonin toxicity, ECG changes and anticholinergic effects.
What other medicines interact with Trimipramine?
MediHelp also lists interactions of Trimipramine with, for example, Disopyramide, Dofetilide, Ibutilide. The full list is on the Trimipramine page.
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