Drug interactions
Flecainide + Marijuana
Severity: Moderate
Flecainide and Marijuana: moderate 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
Cannabis constituents such as cannabidiol may inhibit CYP2D6 and could raise flecainide levels, while cannabis also causes tachycardia. Clinical data are limited.
What this interaction means in plain words
Flecainide and Marijuana can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Cannabinoids, notably cannabidiol, may inhibit CYP2D6 and add tachycardic effects.
What to do
Monitor ECG and heart rate in regular cannabis users. Check flecainide levels if toxicity is suspected.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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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 Marijuana?
MediHelp rates the interaction as moderate. Flecainide and Marijuana can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Cannabis constituents such as cannabidiol may inhibit CYP2D6 and could raise flecainide levels, while cannabis also causes tachycardia. Clinical data are limited.
How serious is the interaction between Flecainide and Marijuana?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor ECG and heart rate in regular cannabis users. Check flecainide levels if toxicity is suspected.
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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