NutriStack
Digoxin and Potassium, a caution.
Hypokalemia dramatically increases the risk of digoxin toxicity, including life-threatening cardiac arrhythmias. Conversely, hyperkalemia with digoxin can also be dangerous. Potassium levels must be kept within a very narrow range for safe digoxin therapy.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
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At a glance
- Pair type
- Caution
- Evidence (highest tier)
- Strong
- Source citations
- 4 sources
- Stack Score effect
- −5 to your Stack Score (per scored caution row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Caution · Strong evidence
Caution
What is happening. Hypokalemia dramatically increases the risk of digoxin toxicity, including life-threatening cardiac arrhythmias. Conversely, hyperkalemia with digoxin can also be dangerous. Potassium levels must be kept within a very narrow range for safe digoxin therapy.
Mechanism. Digoxin inhibits the Na+/K+-ATPase. Hypokalemia reduces extracellular potassium competition for the ATPase binding site, increasing digoxin binding and toxicity. Hyperkalemia can also increase digoxin displacement from its binding site, leading to unpredictable cardiac effects.
Recommendation. Monitor potassium levels closely while on digoxin. Target serum potassium of 4.0-5.0 mEq/L. Potassium supplementation may be needed, especially if also taking diuretics, but avoid oversupplementation. Discuss with your prescriber.
Sources (4)
- Smith TW. Digitalis: mechanisms of action and clinical use. N Engl J Med. 1988;318(6):358-365. PMID 3277052
- Filippini T, Naska A, Kasdagli MI et al.. Potassium Intake and Blood Pressure: A Dose-Response Meta-Analysis of Randomized Controlled Trials. Journal of the American Heart Association. 2020. PMID 32500831
- Behers BJ, Behers BM, Stephenson-Moe CA et al.. Magnesium and Potassium Supplementation for Systolic Blood Pressure Reduction in the General Normotensive Population: A Systematic Review and Subgroup Meta-Analysis for Optimal Dosage and Treatment Length. Nutrients. 2024. PMID 39519450
- D'Elia L, Cappuccio FP, Masulli M et al.. Effect of Potassium Supplementation on Endothelial Function: A Systematic Review and Meta-Analysis of Intervention Studies. Nutrients. 2023. PMID 36839211
Stack Score
How this pair moves the number.
Effect on the composite score
If both Digoxin and Potassium are in the same stack, this pair applies −5 to your Stack Score (per scored caution row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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