Drug interactions
Telmisartan + Tolvaptan
Severity: Moderate
Telmisartan and Tolvaptan: 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
Tolvaptan, a vasopressin antagonist, is not generally potassium-sparing, though labeling advises monitoring potassium in patients on drugs that raise potassium. Combined with an ARB, serum potassium may rise in some patients, and tolvaptan-induced volume loss can add to ARB-related renal effects.
What this interaction means in plain words
Telmisartan and Tolvaptan 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.
Telmisartan belongs to Cardiovascular; Tolvaptan belongs to Endocrine.
Why it happens
Telmisartan reduces aldosterone-mediated potassium excretion, and tolvaptan-induced aquaresis with volume depletion may further affect renal function and potassium balance.
What to do
Monitor serum potassium, sodium and renal function after starting the combination. Avoid overly rapid sodium correction and fluid depletion.
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 Telmisartan
- Aliskiren + Telmisartan Contraindicated
- Sparsentan + Telmisartan Contraindicated
- Amifostine + Telmisartan Major
- Amiloride + Telmisartan Major
- Amlodipine-benazepril + Telmisartan Major
- Amlodipine-hydrochlorothiazide-valsartan + Telmisartan Major
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 Telmisartan with Tolvaptan?
MediHelp rates the interaction as moderate. Telmisartan and Tolvaptan 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. Tolvaptan, a vasopressin antagonist, is not generally potassium-sparing, though labeling advises monitoring potassium in patients on drugs that raise potassium. Combined with an ARB, serum potassium may rise in some patients, and tolvaptan-induced volume loss can add to ARB-related renal effects.
How serious is the interaction between Telmisartan and Tolvaptan?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor serum potassium, sodium and renal function after starting the combination. Avoid overly rapid sodium correction and fluid depletion.
What other medicines interact with Telmisartan?
MediHelp also lists interactions of Telmisartan with, for example, Aliskiren, Sparsentan, Amifostine. The full list is on the Telmisartan page.
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