Drug interactions
Flecainide + Mobocertinib
Severity: Major
Flecainide and Mobocertinib: major 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
Mobocertinib prolongs the QTc interval and can cause serious ventricular arrhythmias. Flecainide has its own proarrhythmic potential, so combined use increases the risk of torsade de pointes and sudden death.
What this interaction means in plain words
Flecainide and Mobocertinib can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Additive effects on cardiac repolarization and conduction.
What to do
Avoid the combination and choose an alternative antiarrhythmic if possible. If unavoidable, reduce the mobocertinib dose per labeling and monitor ECG and electrolytes frequently.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Flecainide
- Flecainide + Nirmatrelvir Contraindicated
- Flecainide + Nirmatrelvir / ritonavir Contraindicated
- Flecainide + Pimozide Contraindicated
- Flecainide + Ritonavir Contraindicated
- Flecainide + Thioridazine Contraindicated
- Flecainide + Tipranavir Contraindicated
Frequently asked questions
Can I take Flecainide with Mobocertinib?
MediHelp rates the interaction as major. Flecainide and Mobocertinib can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Mobocertinib prolongs the QTc interval and can cause serious ventricular arrhythmias. Flecainide has its own proarrhythmic potential, so combined use increases the risk of torsade de pointes and sudden death.
How serious is the interaction between Flecainide and Mobocertinib?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination and choose an alternative antiarrhythmic if possible. If unavoidable, reduce the mobocertinib dose per labeling and monitor ECG and electrolytes frequently.
What other medicines interact with Flecainide?
MediHelp also lists interactions of Flecainide with, for example, Nirmatrelvir, Nirmatrelvir / ritonavir, Pimozide. The full list is on the Flecainide page.
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