NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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What does vasopressin primarily act as?

  1. Beta agonist

  2. Dopamine agonist

  3. Vasopressor

  4. Vasodilator

The correct answer is: Vasopressor

Vasopressin primarily acts as a vasopressor, meaning it constricts blood vessels and increases blood pressure. This is different from a beta agonist (A) or dopamine agonist (B) which act on specific receptors in the body to produce different effects. Vasopressin does have some vasodilating properties, but this is not its primary function (D). Therefore, the correct answer is C, vasopressor.

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