Phenelzine

Phenelzine

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MAOI Some Weight Gain Risk
Sedating: Can be Driving: Caution QT risk: Low Akathisia: Low Metabolic: Moderate Prolactin: Low t½: 11 h Tmax: 2 h

The heavyweight irreversible MAOI. For people with treatment-resistant depression or severe social anxiety, phenelzine can be life-changing — but it comes with a laundry list of diet and drug restrictions. Tyramine foods (aged cheese, cured meats, some beers) can trigger hypertensive crises. Mix it with SSRIs or tramadol and you risk serotonin syndrome. Not easy to live with, but when it works, it can feel like night and day.

🩺 Main Uses

Treatment‑resistant depression; social anxiety disorder.

🧪 The Science & Facts

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Half‑life (t½)

11 h

How long the drug hangs around. Longer half‑life = slower changes.

Time to Peak (Tmax)

2 h

Roughly when you feel the main effect after a dose.

What it hits (receptors)

Primary:

MAO-A (irreversible inhibitor)MAO-B (irreversible inhibitor)

Boosts monoamines (5-HT, NE, DA).

How your body processes it (metabolism)

Not CYP-driven; interaction risk is mainly pharmacodynamic.

⚠️ Warnings

  • Hypertensive crisis with tyramine foods; life‑threatening interactions with SSRIs, TCAs, tramadol, dextromethorphan.

⏬ Taper & Withdrawal

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If you’re reducing

Introduce slowly; educate on tyramine diet and interaction list. Taper over weeks when stopping.

Possible withdrawal

Insomnia, agitation, mood dip; rare withdrawal if tapered.

Info here is educational, not medical advice. Always taper with prescriber support if possible.

🧠 Trusted External Sources Last reviewed 22 Aug 2025, 21:24 by Connor O’Driscoll

🔗 Interaction Checker

Always verify drug interactions using the Drugs.com Checker.

Need Help Getting Off This?

Try your GP first. If that doesn't help, find local support services who understand tapering.

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⚠️ Black Box Warning

Contraindicated with many drugs; 2-week washout (5 weeks after fluoxetine) required when switching.

This is a plain‑English summary of headline safety warnings. Talk to a clinician before changing any medication.