Drug interactions
Azithromycin + Omeprazole
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
Omeprazole-associated hypomagnesemia (typically with prolonged PPI use) may increase susceptibility to azithromycin-induced QT prolongation and torsades de pointes. No meaningful pharmacokinetic interaction is expected.
Mechanism of action
Pharmacodynamic: Chronic PPI therapy can lower serum magnesium, which predisposes to ventricular arrhythmias with QT-prolonging agents like azithromycin; no significant CYP-mediated effect is expected.
Clinical management
If patient is on chronic omeprazole or has risk factors, check and correct magnesium and potassium before/during azithromycin therapy; consider ECG monitoring in high-risk patients; minimize other QT-prolonging drugs; consider alternative non–QT-prolonging antibiotic if baseline QTc is prolonged or significant arrhythmia risk exists; monitor magnesium periodically during long-term PPI therapy.
Drug reference
References
- FDA Drug Safety Communication: Low magnesium levels can be associated with long-term use of proton pump inhibitor drugs (PPIs) — FDA
- Omeprazole (Prilosec) Prescribing Information – Hypomagnesemia warning — FDA Label
- Azithromycin (Zithromax) Prescribing Information – QT prolongation and torsades de pointes — FDA Label
- Proton Pump Inhibitors and QT-Prolonging Agents – Interaction monograph — Lexicomp
Frequently asked questions
Can I take Azithromycin with Omeprazole?
The interaction is rated: Moderate. Omeprazole-associated hypomagnesemia (typically with prolonged PPI use) may increase susceptibility to azithromycin-induced QT prolongation and torsades de pointes. No meaningful pharmacokinetic interaction is expected.
How serious is the interaction between Azithromycin and Omeprazole?
The interaction is rated: Moderate. Evidence level: Moderate.
How is the interaction between Azithromycin and Omeprazole managed?
If patient is on chronic omeprazole or has risk factors, check and correct magnesium and potassium before/during azithromycin therapy; consider ECG monitoring in high-risk patients; minimize other QT-prolonging drugs; consider alternative non–QT-prolonging antibiotic if baseline QTc is prolonged or significant arrhythmia risk exists; monitor magnesium periodically during long-term PPI therapy.
Why do Azithromycin and Omeprazole interact?
Pharmacodynamic: Chronic PPI therapy can lower serum magnesium, which predisposes to ventricular arrhythmias with QT-prolonging agents like azithromycin; no significant CYP-mediated effect is expected.
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