Drug interactions
Ephedrine + Tolvaptan
Severity: Minor
Ephedrine and Tolvaptan: minor 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
Ephedrine may lower serum potassium via beta-2 stimulation, while tolvaptan may raise it. The net effect on potassium is uncertain and generally small.
What this interaction means in plain words
Ephedrine and Tolvaptan have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Ephedrine belongs to Cardiovascular; Tolvaptan belongs to Endocrine.
Why it happens
Opposing effects on serum potassium: beta-adrenergic cellular uptake versus tolvaptan-related increase.
What to do
Monitor serum potassium if used in acutely ill patients or at high doses. No routine adjustment is needed.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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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 Ephedrine
- Ephedrine + Isocarboxazid Contraindicated
- Ephedrine + Phenelzine Contraindicated
- Ephedrine + Procarbazine Contraindicated
- Ephedrine + Rasagiline Contraindicated
- Ephedrine + Selegiline Contraindicated
- Ephedrine + Tranylcypromine Contraindicated
Frequently asked questions
Can I take Ephedrine with Tolvaptan?
MediHelp rates the interaction as minor. Ephedrine and Tolvaptan have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Ephedrine may lower serum potassium via beta-2 stimulation, while tolvaptan may raise it. The net effect on potassium is uncertain and generally small.
How serious is the interaction between Ephedrine and Tolvaptan?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor serum potassium if used in acutely ill patients or at high doses. No routine adjustment is needed.
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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