Drug interactions
Digoxin + Potassium chloride
Severity: Moderate
Digoxin and Potassium chloride: 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
Potassium supplementation alters digoxin effect because potassium competes with digoxin at the Na+/K+-ATPase. Hypokalemia increases digoxin toxicity, while excess potassium can cause hyperkalemia and conduction block, which is additive with digoxin's effects on AV conduction.
What this interaction means in plain words
Digoxin and Potassium chloride 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.
Digoxin belongs to Cardiovascular; Potassium chloride belongs to Gastrointestinal Tract.
Why it happens
Serum potassium modulates digoxin binding to Na+/K+-ATPase, and hyperkalemia adds to digoxin's AV nodal slowing.
What to do
Monitor serum potassium and ECG, and keep potassium within the normal range. Avoid unmonitored potassium supplementation, particularly with renal impairment or AV block.
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 Digoxin
- Digoxin + Lily of the valley Contraindicated
- Digoxin + Squill Contraindicated
- Adagrasib + Digoxin Major
- Amiodarone + Digoxin Major
- Amlodipine-hydrochlorothiazide-valsartan + Digoxin Major
- Amphotericin b deoxycholate + Digoxin Major
Other interactions of Potassium chloride
Frequently asked questions
Can I take Digoxin with Potassium chloride?
MediHelp rates the interaction as moderate. Digoxin and Potassium chloride 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. Potassium supplementation alters digoxin effect because potassium competes with digoxin at the Na+/K+-ATPase. Hypokalemia increases digoxin toxicity, while excess potassium can cause hyperkalemia and conduction block, which is additive with digoxin's effects on AV conduction.
How serious is the interaction between Digoxin and Potassium chloride?
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 and ECG, and keep potassium within the normal range. Avoid unmonitored potassium supplementation, particularly with renal impairment or AV block.
What other medicines interact with Digoxin?
MediHelp also lists interactions of Digoxin with, for example, Lily of the valley, Squill, Adagrasib. The full list is on the Digoxin page.
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