Drug interactions
Candesartan + Tolvaptan
Severity: Moderate
Candesartan 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 may be associated with potassium increases and can cause rapid fluid loss. With candesartan, which reduces aldosterone effect, potassium may rise further and hypotension or renal changes may occur.
What this interaction means in plain words
Candesartan 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.
Candesartan belongs to Cardiovascular; Tolvaptan belongs to Endocrine.
Why it happens
ARB-induced reduction in aldosterone-mediated potassium excretion adds to a tolvaptan-associated potassium rise; the pharmacodynamic effects are additive.
What to do
Monitor serum potassium, renal function, volume status and blood pressure after starting or changing doses.
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 Candesartan
- Aliskiren + Candesartan Contraindicated
- Candesartan + Sparsentan Contraindicated
- Amifostine + Candesartan Major
- Amiloride + Candesartan Major
- Amlodipine-benazepril + Candesartan Major
- Amlodipine-hydrochlorothiazide-valsartan + Candesartan 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 Candesartan with Tolvaptan?
MediHelp rates the interaction as moderate. Candesartan 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 may be associated with potassium increases and can cause rapid fluid loss. With candesartan, which reduces aldosterone effect, potassium may rise further and hypotension or renal changes may occur.
How serious is the interaction between Candesartan 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, renal function, volume status and blood pressure after starting or changing doses.
What other medicines interact with Candesartan?
MediHelp also lists interactions of Candesartan with, for example, Aliskiren, Sparsentan, Amifostine. The full list is on the Candesartan page.
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