Neuro-pharmacology · USMLE Step 1

A patient taking bupropion for depression asks why it does not cause sexual dysfunction like SSRIs. What is its mechanism?

  1. Serotonin 5-HT1A partial agonism
  2. Norepinephrine-dopamine reuptake inhibition
  3. Presynaptic α2-receptor antagonism
  4. Monoamine oxidase (MAO) inhibition
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Correct answer: Norepinephrine-dopamine reuptake inhibition

Bupropion increases norepinephrine and dopamine without significant serotonergic activity, reducing risk of sexual side effects.

Difficulty: Medium Question 20 of 20

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