Galen Pharmacology Exam 1 Practice Test 2026 - Free Pharmacology Practice Questions and Study Guide

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Which of the following is an MAOI?

Desvenlafaxine

Amitriptyline

Lithium

Phenelzine

Monoamine oxidase inhibitors block the enzyme that breaks down monoamines in the brain, raising levels of serotonin, norepinephrine, and dopamine to improve mood. Phenelzine is a classic MAOI, irreversibly inhibiting MAO-A and MAO-B. The other drugs belong to different classes—desvenlafaxine is an SNRI, amitriptyline is a TCA, and lithium is a mood stabilizer—so they do not inhibit monoamine oxidase. Therefore, Phenelzine is the MAOI.

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