NutriStack
Ivabradine and Potassium, a caution.
Ivabradine lowers heart rate and has rare reports of torsades de pointes when other risk factors are present. Low potassium increases torsades risk with bradycardia and QT-risk drugs. Potassium supplements are not routinely needed with ivabradine, but potassium deficiency should be corrected under monitoring.
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
- Substances
- Ivabradine and Potassium
- Pair type
- Caution
- Evidence (highest tier)
- Emerging
- Source citations
- 2 sources
- Stack Score effect
- −5 to your Stack Score (per scored caution row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Caution · Emerging evidence
Caution
What is happening. Ivabradine lowers heart rate and has rare reports of torsades de pointes when other risk factors are present. Low potassium increases torsades risk with bradycardia and QT-risk drugs. Potassium supplements are not routinely needed with ivabradine, but potassium deficiency should be corrected under monitoring.
Mechanism. Ivabradine inhibits the sinoatrial If current and can produce bradycardia, which lengthens repolarization time and can contribute to pause-dependent torsades in susceptible patients. Hypokalemia further reduces repolarizing potassium current and lowers repolarization reserve.
Recommendation. Keep potassium in the normal range while using ivabradine, especially during diuretic use, gastrointestinal illness, or addition of other QT-prolonging medicines. Do not self-treat with high-dose potassium unless your clinician is checking blood potassium and kidney function. Report fainting, near-fainting, or new sustained palpitations promptly.
Sources (2)
- Cocco G, Jerie P. Torsades de pointes induced by the concomitant use of ivabradine and azithromycin: an unexpected dangerous interaction. Cardiovasc Toxicol. 2015;15(1):104-106. PMID 25158669
- 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
Stack Score
How this pair moves the number.
Effect on the composite score
If both Ivabradine 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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