NutriStack
Amiodarone and Potassium, a synergy.
Amiodarone can prolong the QT interval and rarely trigger torsades de pointes. Low potassium greatly increases that risk because it reduces the heart's repolarization reserve. Potassium supplementation is useful only when potassium is low or intake is inadequate; too much potassium can be dangerous, especially with kidney disease or RAAS-blocking drugs.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
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From the interaction database
What the row says.
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At a glance
- Substances
- Amiodarone and Potassium
- Pair type
- Synergy
- Evidence (highest tier)
- Moderate
- Source citations
- 2 sources
- Stack Score effect
- +2 to your Stack Score (per scored synergy row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Synergy · Moderate evidence
Synergy
What is happening. Amiodarone can prolong the QT interval and rarely trigger torsades de pointes. Low potassium greatly increases that risk because it reduces the heart's repolarization reserve. Potassium supplementation is useful only when potassium is low or intake is inadequate; too much potassium can be dangerous, especially with kidney disease or RAAS-blocking drugs.
Mechanism. Amiodarone blocks cardiac potassium currents and prolongs repolarization. Hypokalemia further reduces IKr reserve and promotes early afterdepolarizations, while potassium repletion lowers susceptibility to drug-induced torsades.
Recommendation. Keep potassium in the normal range while taking amiodarone, and have levels checked if you use diuretics, have vomiting or diarrhea, or have kidney disease. Do not start potassium tablets or high-dose electrolyte powders unless your prescriber is monitoring your blood potassium.
Sources (2)
- Tisdale JE. Drug-induced QT interval prolongation and torsades de pointes: Role of the pharmacist in risk assessment, prevention and management. Can Pharm J (Ott). 2016;149(3):139-152. PMID 27212965
- Yau S, Chan P, Sapkin J, Hsieh E. Short-term use of oral amiodarone causing torsades de pointes. Clin Case Rep. 2018;6(8):1554-1556. PMID 30147903
Stack Score
How this pair moves the number.
Effect on the composite score
If both Amiodarone and Potassium are in the same stack, this pair applies +2 to your Stack Score (per scored synergy row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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