Drug interactions
Encorafenib + Flecainide
Severity: Major
Encorafenib and Flecainide: 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
Encorafenib can cause dose-dependent QT prolongation, and flecainide affects cardiac conduction. Together they may increase the risk of ventricular arrhythmia.
What this interaction means in plain words
Encorafenib and Flecainide 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.
Encorafenib belongs to Oncology; Flecainide belongs to Cardiovascular.
Why it happens
Additive pharmacodynamic effects on cardiac conduction and repolarization.
What to do
Avoid the combination if possible. If it is necessary, obtain ECGs and electrolytes before and during treatment, and reduce or stop encorafenib if the QTc rises significantly.
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
Other interactions of Encorafenib
Frequently asked questions
Can I take Encorafenib with Flecainide?
MediHelp rates the interaction as major. Encorafenib and Flecainide 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. Encorafenib can cause dose-dependent QT prolongation, and flecainide affects cardiac conduction. Together they may increase the risk of ventricular arrhythmia.
How serious is the interaction between Encorafenib and Flecainide?
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 if possible. If it is necessary, obtain ECGs and electrolytes before and during treatment, and reduce or stop encorafenib if the QTc rises significantly.
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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