Drug interactions
Rifampin + Tolvaptan
Severity: Major
Rifampin 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
Rifampin is a potent CYP3A4 inducer and greatly reduces tolvaptan exposure. Therapeutic effect is likely lost, and labeling advises against the combination.
What this interaction means in plain words
Rifampin 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.
Why it happens
Strong induction of CYP3A4 (and possibly P-gp) increases tolvaptan clearance.
What to do
Avoid concomitant use. If rifampin is essential, monitor serum sodium closely and expect to need a higher tolvaptan dose or an alternative therapy.
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
Frequently asked questions
Can I take Rifampin with Tolvaptan?
MediHelp rates the interaction as major. Rifampin 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. Rifampin is a potent CYP3A4 inducer and greatly reduces tolvaptan exposure. Therapeutic effect is likely lost, and labeling advises against the combination.
How serious is the interaction between Rifampin 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 concomitant use. If rifampin is essential, monitor serum sodium closely and expect to need a higher tolvaptan dose or an alternative therapy.
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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