Drug interactions
Encainide + Venlafaxine
Severity: Moderate
Encainide and Venlafaxine: 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
Encainide is activated and cleared by CYP2D6, and venlafaxine is a weak CYP2D6 inhibitor. Reduced activation could alter antiarrhythmic effect, while encainide has proarrhythmic potential, so any change matters. The effect of venlafaxine is likely small and encainide is rarely used now.
What this interaction means in plain words
Encainide and Venlafaxine 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
Weak CYP2D6 inhibition by venlafaxine alters encainide metabolism.
What to do
Monitor ECG and arrhythmia control if the combination is necessary. Adjust encainide dosing according to response.
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 Venlafaxine
- Isocarboxazid + Venlafaxine Contraindicated
- Methylene blue + Venlafaxine Contraindicated
- Phenelzine + Venlafaxine Contraindicated
- Procarbazine + Venlafaxine Contraindicated
- Rasagiline + Venlafaxine Contraindicated
- Safinamide + Venlafaxine Contraindicated
Frequently asked questions
Can I take Encainide with Venlafaxine?
MediHelp rates the interaction as moderate. Encainide and Venlafaxine 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. Encainide is activated and cleared by CYP2D6, and venlafaxine is a weak CYP2D6 inhibitor. Reduced activation could alter antiarrhythmic effect, while encainide has proarrhythmic potential, so any change matters. The effect of venlafaxine is likely small and encainide is rarely used now.
How serious is the interaction between Encainide and Venlafaxine?
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 arrhythmia control if the combination is necessary. Adjust encainide dosing according to response.
What other medicines interact with Venlafaxine?
MediHelp also lists interactions of Venlafaxine with, for example, Isocarboxazid, Methylene blue, Phenelzine. The full list is on the Venlafaxine page.
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