Drug interactions
Clarithromycin + Mavacamten
Severity: Contraindicated
Clarithromycin and Mavacamten: contraindicated interaction.
Last updated
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.
Summary
Clarithromycin may substantially increase mavacamten exposure, which can excessively reduce left ventricular ejection fraction and cause heart failure from systolic dysfunction. Strong CYP3A4 inhibitors are contraindicated in the labeling.
What this interaction means in plain words
Clarithromycin and Mavacamten are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two.
Clarithromycin belongs to Anti Bacterial; Mavacamten belongs to Cardiovascular.
Why it happens
Clarithromycin inhibits CYP3A4 (and CYP2C19 contributions) and thereby reduces mavacamten clearance.
What to do
Do not coadminister; use an alternative antibiotic such as azithromycin and monitor LVEF if exposure occurs.
What to ask your pharmacist
- Is there an alternative to one of these two medicines for me?
- If both are essential, who is monitoring me and how often?
- Which symptoms mean I should stop and seek help straight away?
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Other interactions of Clarithromycin
- Astemizole + Clarithromycin Contraindicated
- Avanafil + Clarithromycin Contraindicated
- Cisapride + Clarithromycin Contraindicated
- Clarithromycin + Colchicine Contraindicated
- Clarithromycin + Conivaptan Contraindicated
- Clarithromycin + Dihydroergotamine Contraindicated
Other interactions of Mavacamten
- Apalutamide + Mavacamten Contraindicated
- Carbamazepine + Mavacamten Contraindicated
- Dexlansoprazole + Mavacamten Contraindicated
- Efavirenz + Mavacamten Contraindicated
- Enzalutamide + Mavacamten Contraindicated
- Eslicarbazepine + Mavacamten Contraindicated
Frequently asked questions
Can I take Clarithromycin with Mavacamten?
MediHelp rates the interaction as contraindicated. Clarithromycin and Mavacamten are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two. Clarithromycin may substantially increase mavacamten exposure, which can excessively reduce left ventricular ejection fraction and cause heart failure from systolic dysfunction. Strong CYP3A4 inhibitors are contraindicated in the labeling.
How serious is the interaction between Clarithromycin and Mavacamten?
MediHelp rates it contraindicated, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Do not coadminister; use an alternative antibiotic such as azithromycin and monitor LVEF if exposure occurs.
What other medicines interact with Clarithromycin?
MediHelp also lists interactions of Clarithromycin with, for example, Astemizole, Avanafil, Cisapride. The full list is on the Clarithromycin page.
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