Drug interactions
Desvenlafaxine + Nefazodone
Severity: Major
Desvenlafaxine and Nefazodone: major interaction.
Last updated Sources: US FDA label
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
Both drugs have serotonergic activity, so combining them raises the risk of serotonin syndrome. Nefazodone also inhibits CYP3A4, which has a minor role in desvenlafaxine metabolism, and it carries a hepatotoxicity warning.
What this interaction means in plain words
Desvenlafaxine and Nefazodone 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
Additive serotonergic effects from SNRI reuptake inhibition and nefazodone's serotonin reuptake inhibition and 5-HT2A antagonism, plus possible CYP3A4 inhibition.
What to do
Avoid concurrent use; when switching, taper the first drug and monitor for serotonin toxicity. Check blood pressure and watch for agitation, tremor and hyperthermia if overlap is unavoidable.
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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References
Other interactions of Desvenlafaxine
- Desvenlafaxine + Isocarboxazid Contraindicated
- Desvenlafaxine + Methylene blue Contraindicated
- Desvenlafaxine + Phenelzine Contraindicated
- Desvenlafaxine + Rasagiline Contraindicated
- Desvenlafaxine + Safinamide Contraindicated
- Desvenlafaxine + Selegiline Contraindicated
Frequently asked questions
Can I take Desvenlafaxine with Nefazodone?
MediHelp rates the interaction as major. Desvenlafaxine and Nefazodone 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. Both drugs have serotonergic activity, so combining them raises the risk of serotonin syndrome. Nefazodone also inhibits CYP3A4, which has a minor role in desvenlafaxine metabolism, and it carries a hepatotoxicity warning.
How serious is the interaction between Desvenlafaxine and Nefazodone?
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 concurrent use; when switching, taper the first drug and monitor for serotonin toxicity. Check blood pressure and watch for agitation, tremor and hyperthermia if overlap is unavoidable.
What other medicines interact with Desvenlafaxine?
MediHelp also lists interactions of Desvenlafaxine with, for example, Isocarboxazid, Methylene blue, Phenelzine. The full list is on the Desvenlafaxine page.
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