Phenelzine and Venlafaxine: Drug Interaction Guide

Quick answer: This is a major interaction — avoid combining Phenelzine and Venlafaxine unless specifically directed by your doctor.

Interaction severity: Major — avoid combination

How Phenelzine interacts with Venlafaxine

Irreversible monoamine oxidase inhibition combined with serotonin and noradrenaline reuptake inhibition can cause severe serotonin toxicity and hypertensive reactions.

What you should do

Coadministration is contraindicated. Observe the required washout interval when switching between phenelzine and venlafaxine.

Key facts

Severity

Major — avoid combination

Mechanism

Irreversible monoamine oxidase inhibition combined with serotonin and noradrenaline reuptake inhibition can cause severe...

Action

Coadministration is contraindicated. Observe the required washout interval when switching between phenelzine and venlafa...

Important medical disclaimer: This page provides educational information about drug interactions for general reference. It is not a substitute for professional medical advice, diagnosis, or treatment. Always discuss your specific medications with a qualified healthcare provider before starting, stopping, or changing any treatment. About our editorial team.

Frequently asked questions

Can I take Phenelzine and Venlafaxine together?

No — this combination should generally be avoided. Coadministration is contraindicated. Observe the required washout interval when switching between phenelzine and venlafaxine.

What is the severity of this interaction?

The interaction between Phenelzine and Venlafaxine is classified as Major — avoid combination. Irreversible monoamine oxidase inhibition combined with serotonin and noradrenaline reuptake inhibition can cause severe serotonin toxicity and hypertensive reactions.

What should I do if I'm prescribed both?

Coadministration is contraindicated. Observe the required washout interval when switching between phenelzine and venlafaxine. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

Last reviewed: by iMedic Medical Editorial Team. Our editorial process.