Phenylephrine reduces secretion of mucus and causes blood vessel constriction, and therefore alleviates nasal congestion because it
A) is an agonist of epinephrine
B) is an antagonist of epinephrine
C) competes with epinephrine
D) it is a blocker of the receptor

Question

Quizplus · Accepted Answer

Phenylephrine is an agonist of alpha-1 adrenergic receptors, similar to how epinephrine acts, but it is more selective. By stimulating these receptors, it causes vasoconstriction, which reduces swelling and congestion in the nasal passages.

Phenylephrine Reduces Secretion of Mucus and Causes Blood Vessel Constriction