Phenelzine and Pseudoephedrine: Drug Interaction Guide

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

Interaction severity: Major — avoid combination

How Phenelzine interacts with Pseudoephedrine

Pseudoephedrine releases stored noradrenaline from sympathetic nerve terminals; MAO inhibition by phenelzine prevents its breakdown, producing a hypertensive crisis.

What you should do

The combination is contraindicated. Counsel MAOI patients to avoid OTC decongestants and recommend saline sprays or intranasal corticosteroids instead.

Key facts

Severity

Major — avoid combination

Mechanism

Pseudoephedrine releases stored noradrenaline from sympathetic nerve terminals; MAO inhibition by phenelzine prevents it...

Action

The combination is contraindicated. Counsel MAOI patients to avoid OTC decongestants and recommend saline sprays or intr...

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 Pseudoephedrine together?

No — this combination should generally be avoided. The combination is contraindicated. Counsel MAOI patients to avoid OTC decongestants and recommend saline sprays or intranasal corticosteroids instead.

What is the severity of this interaction?

The interaction between Phenelzine and Pseudoephedrine is classified as Major — avoid combination. Pseudoephedrine releases stored noradrenaline from sympathetic nerve terminals; MAO inhibition by phenelzine prevents its breakdown, producing a hypertensive crisis.

What should I do if I'm prescribed both?

The combination is contraindicated. Counsel MAOI patients to avoid OTC decongestants and recommend saline sprays or intranasal corticosteroids instead. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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