Drug interactions
Potassium acid + Tolvaptan
Severity: Moderate
Potassium acid 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 has been associated with small increases in serum potassium, and potassium phosphate supplements add a potassium load. In patients with renal impairment or other hyperkalemia risks, the combination may cause clinically important hyperkalemia.
What this interaction means in plain words
Potassium acid 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.
Why it happens
Additive effect on serum potassium from supplementation and tolvaptan-related potassium increases.
What to do
Check serum potassium at baseline and periodically, especially in renal impairment, and reduce or stop the potassium supplement if levels rise.
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 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 Potassium acid with Tolvaptan?
MediHelp rates the interaction as moderate. Potassium acid 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 has been associated with small increases in serum potassium, and potassium phosphate supplements add a potassium load. In patients with renal impairment or other hyperkalemia risks, the combination may cause clinically important hyperkalemia.
How serious is the interaction between Potassium acid 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: Check serum potassium at baseline and periodically, especially in renal impairment, and reduce or stop the potassium supplement if levels rise.
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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