Drug interactions
Mavacamten + Posaconazole
Severity: Contraindicated
Mavacamten and Posaconazole: 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
Posaconazole can greatly increase mavacamten exposure, with a risk of excessive reduction in ejection fraction and heart failure from systolic dysfunction.
What this interaction means in plain words
Mavacamten and Posaconazole 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.
Mavacamten belongs to Cardiovascular; Posaconazole belongs to Anti Fungals.
Why it happens
Posaconazole strongly inhibits CYP3A4, which contributes to mavacamten clearance.
What to do
Do not co-administer. Use an alternative antifungal, or hold mavacamten per labeling and reassess ejection fraction.
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 Posaconazole
- Artemether + Posaconazole Contraindicated
- Avanafil + Posaconazole Contraindicated
- Cobimetinib + Posaconazole Contraindicated
- Conivaptan + Posaconazole Contraindicated
- Dihydroergotamine intranasal + Posaconazole Contraindicated
- Dihydroergotamine + Posaconazole Contraindicated
Other interactions of Mavacamten
- Apalutamide + Mavacamten Contraindicated
- Carbamazepine + Mavacamten Contraindicated
- Clarithromycin + Mavacamten Contraindicated
- Dexlansoprazole + Mavacamten Contraindicated
- Efavirenz + Mavacamten Contraindicated
- Enzalutamide + Mavacamten Contraindicated
Frequently asked questions
Can I take Mavacamten with Posaconazole?
MediHelp rates the interaction as contraindicated. Mavacamten and Posaconazole 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. Posaconazole can greatly increase mavacamten exposure, with a risk of excessive reduction in ejection fraction and heart failure from systolic dysfunction.
How serious is the interaction between Mavacamten and Posaconazole?
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 co-administer. Use an alternative antifungal, or hold mavacamten per labeling and reassess ejection fraction.
What other medicines interact with Posaconazole?
MediHelp also lists interactions of Posaconazole with, for example, Artemether, Avanafil, Cobimetinib. The full list is on the Posaconazole page.
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