Drug interactions
Tropisetron + Venlafaxine
Severity: Moderate
Tropisetron and Venlafaxine: moderate 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
Tropisetron, a 5-HT3 antagonist, may prolong the QT interval, and venlafaxine may add to this at higher doses. Both agents also carry a low risk of serotonergic effects.
What this interaction means in plain words
Tropisetron and Venlafaxine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Additive QT prolongation, with overlapping serotonergic activity.
What to do
Correct hypokalemia and hypomagnesemia and check ECG in patients with cardiac risk factors. Monitor for palpitations, syncope and signs of serotonin toxicity.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Venlafaxine
- Isocarboxazid + Venlafaxine Contraindicated
- Methylene blue + Venlafaxine Contraindicated
- Phenelzine + Venlafaxine Contraindicated
- Procarbazine + Venlafaxine Contraindicated
- Rasagiline + Venlafaxine Contraindicated
- Safinamide + Venlafaxine Contraindicated
Frequently asked questions
Can I take Tropisetron with Venlafaxine?
MediHelp rates the interaction as moderate. Tropisetron and Venlafaxine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Tropisetron, a 5-HT3 antagonist, may prolong the QT interval, and venlafaxine may add to this at higher doses. Both agents also carry a low risk of serotonergic effects.
How serious is the interaction between Tropisetron and Venlafaxine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Correct hypokalemia and hypomagnesemia and check ECG in patients with cardiac risk factors. Monitor for palpitations, syncope and signs of serotonin toxicity.
What other medicines interact with Venlafaxine?
MediHelp also lists interactions of Venlafaxine with, for example, Isocarboxazid, Methylene blue, Phenelzine. The full list is on the Venlafaxine page.
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