Drug interactions
Rifapentine + Tolvaptan
Severity: Major
Rifapentine and Tolvaptan: 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
Rifapentine is a CYP3A4 inducer that is expected to markedly lower tolvaptan exposure. Tolvaptan efficacy may be lost, with recurrent hyponatremia.
What this interaction means in plain words
Rifapentine and Tolvaptan 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.
Rifapentine belongs to Anti Bacterial; Tolvaptan belongs to Endocrine.
Why it happens
Induction of CYP3A4 increases tolvaptan clearance.
What to do
Avoid concurrent use as labeling advises against strong inducers; if unavoidable, monitor serum sodium and consider higher tolvaptan doses.
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 Tolvaptan
- Atazanavir + Tolvaptan Contraindicated
- Ceritinib + Tolvaptan Contraindicated
- Cobicistat + Tolvaptan Contraindicated
- Conivaptan + Tolvaptan Contraindicated
- Darunavir + Tolvaptan Contraindicated
- Idelalisib + Tolvaptan Contraindicated
Other interactions of Rifapentine
- Ledipasvir-sofosbuvir + Rifapentine Contraindicated
- Lorlatinib + Rifapentine Contraindicated
- Lurasidone + Rifapentine Contraindicated
- Ranolazine + Rifapentine Contraindicated
- Rifapentine + Sofosbuvir-velpatasvir Contraindicated
- Rifapentine + Sofosbuvir-velpatasvir-voxilaprevir Contraindicated
Frequently asked questions
Can I take Rifapentine with Tolvaptan?
MediHelp rates the interaction as major. Rifapentine and Tolvaptan 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. Rifapentine is a CYP3A4 inducer that is expected to markedly lower tolvaptan exposure. Tolvaptan efficacy may be lost, with recurrent hyponatremia.
How serious is the interaction between Rifapentine and Tolvaptan?
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 as labeling advises against strong inducers; if unavoidable, monitor serum sodium and consider higher tolvaptan doses.
What other medicines interact with Tolvaptan?
MediHelp also lists interactions of Tolvaptan with, for example, Atazanavir, Ceritinib, Cobicistat. The full list is on the Tolvaptan page.
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