Drug interactions
Saquinavir + Trimipramine
Severity: Major
Saquinavir 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
Saquinavir may raise trimipramine exposure, increasing the risk of tricyclic toxicity. Saquinavir itself also prolongs QT and PR intervals, so the cardiac risk is compounded.
What this interaction means in plain words
Saquinavir 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 saquinavir, plus additive QT prolongation.
What to do
Obtain a baseline ECG and monitor QTc during coadministration, and reduce the trimipramine dose if adverse effects appear. Avoid the combination in patients with existing QT prolongation.
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 Saquinavir with Trimipramine?
MediHelp rates the interaction as major. Saquinavir 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. Saquinavir may raise trimipramine exposure, increasing the risk of tricyclic toxicity. Saquinavir itself also prolongs QT and PR intervals, so the cardiac risk is compounded.
How serious is the interaction between Saquinavir 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: Obtain a baseline ECG and monitor QTc during coadministration, and reduce the trimipramine dose if adverse effects appear. Avoid the combination in patients with existing QT prolongation.
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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