Drug interactions
Lansoprazole + Mavacamten
Severity: Contraindicated
Lansoprazole 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
Lansoprazole inhibits CYP2C19 and can raise mavacamten exposure. Excess mavacamten can reduce left ventricular ejection fraction and cause heart failure from systolic dysfunction.
What this interaction means in plain words
Lansoprazole 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.
Lansoprazole belongs to Gastrointestinal Tract; Mavacamten belongs to Cardiovascular.
Why it happens
Inhibition of CYP2C19-mediated metabolism of mavacamten increases its plasma concentrations.
What to do
Avoid the combination; use an acid suppressant without CYP2C19 inhibition (e.g., an H2 blocker, or per labeling) if required. If started or stopped, follow label guidance with echocardiographic monitoring of 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 Lansoprazole
- Lansoprazole + Rilpivirine Contraindicated
- Acalabrutinib + Lansoprazole Major
- Atazanavir + Lansoprazole Major
- Dacomitinib + Lansoprazole Major
- Dasatinib + Lansoprazole Major
- Erlotinib + Lansoprazole Major
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 Lansoprazole with Mavacamten?
MediHelp rates the interaction as contraindicated. Lansoprazole 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. Lansoprazole inhibits CYP2C19 and can raise mavacamten exposure. Excess mavacamten can reduce left ventricular ejection fraction and cause heart failure from systolic dysfunction.
How serious is the interaction between Lansoprazole 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: Avoid the combination; use an acid suppressant without CYP2C19 inhibition (e.g., an H2 blocker, or per labeling) if required. If started or stopped, follow label guidance with echocardiographic monitoring of ejection fraction.
What other medicines interact with Lansoprazole?
MediHelp also lists interactions of Lansoprazole with, for example, Rilpivirine, Acalabrutinib, Atazanavir. The full list is on the Lansoprazole page.
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