Drug interactions
Azithromycin + Cardiac Disease
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.
Overview
Patients with certain cardiac conditions (baseline QT prolongation, history of torsades, significant bradyarrhythmias, uncompensated heart failure) have increased risk of azithromycin-associated QT prolongation and sudden cardiac death.
Mechanism of action
Pharmacodynamic: azithromycin prolongs ventricular repolarization; underlying cardiac disease increases susceptibility to malignant arrhythmias.
Clinical management
Avoid azithromycin in patients with known QT prolongation, history of torsades, marked bradycardia, or uncompensated HF; select an alternative antibiotic when feasible. If use is necessary, obtain baseline ECG, correct electrolytes, and monitor for palpitations/syncope.
Drug reference
References
- FDA Drug Safety Communication: Azithromycin (Zithromax or Zmax) and the risk of potentially fatal heart rhythms — FDA
- Zithromax (azithromycin) Prescribing Information — FDA Label
- Azithromycin and the risk of cardiovascular death — PubMed
Frequently asked questions
Can I take Azithromycin with Cardiac Disease?
The interaction is rated: Moderate. Patients with certain cardiac conditions (baseline QT prolongation, history of torsades, significant bradyarrhythmias, uncompensated heart failure) have increased risk of azithromycin-associated QT prolongation and sudden cardiac death.
How serious is the interaction between Azithromycin and Cardiac Disease?
The interaction is rated: Moderate. Evidence level: Moderate.
How is the interaction between Azithromycin and Cardiac Disease managed?
Avoid azithromycin in patients with known QT prolongation, history of torsades, marked bradycardia, or uncompensated HF; select an alternative antibiotic when feasible. If use is necessary, obtain baseline ECG, correct electrolytes, and monitor for palpitations/syncope.
Why do Azithromycin and Cardiac Disease interact?
Pharmacodynamic: azithromycin prolongs ventricular repolarization; underlying cardiac disease increases susceptibility to malignant arrhythmias.
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