Drug interactions
Captopril + Potassium chloride
Severity: Major
Captopril and Potassium chloride: major interaction.
Last updated Sources: US FDA label
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
Captopril lowers aldosterone and renal potassium loss, and potassium chloride supplements add potassium. Serious hyperkalemia with arrhythmias can result, especially with renal impairment, diabetes or older age.
What this interaction means in plain words
Captopril and Potassium chloride 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.
Captopril belongs to Cardiovascular; Potassium chloride belongs to Gastrointestinal Tract.
Why it happens
ACE inhibition reduces aldosterone, decreasing renal potassium excretion, while the supplement adds exogenous potassium.
What to do
Use only when hypokalemia is documented, and check serum potassium and creatinine within the first days to weeks, then periodically; reduce or stop the supplement if potassium rises.
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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References
Other interactions of Captopril
- Aliskiren + Captopril Contraindicated
- Captopril + Sacubitril / valsartan Contraindicated
- Captopril + Sacubitril-valsartan Contraindicated
- Amifostine + Captopril Major
- Amiloride + Captopril Major
- Amlodipine-hydrochlorothiazide-valsartan + Captopril Major
Other interactions of Potassium chloride
Frequently asked questions
Can I take Captopril with Potassium chloride?
MediHelp rates the interaction as major. Captopril and Potassium chloride 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. Captopril lowers aldosterone and renal potassium loss, and potassium chloride supplements add potassium. Serious hyperkalemia with arrhythmias can result, especially with renal impairment, diabetes or older age.
How serious is the interaction between Captopril and Potassium chloride?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use only when hypokalemia is documented, and check serum potassium and creatinine within the first days to weeks, then periodically; reduce or stop the supplement if potassium rises.
What other medicines interact with Captopril?
MediHelp also lists interactions of Captopril with, for example, Aliskiren, Sacubitril / valsartan, Sacubitril-valsartan. The full list is on the Captopril page.
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