Which neurotransmitter is primarily affected by the drug Viagra?
A) met-enkephalin
B) acetylcholine
C) dopamine
D) nitric oxide

Question

Quizplus · Accepted Answer

The primary neurotransmitter affected by the drug Viagra is nitric oxide. Viagra works by inhibiting the enzyme phosphodiesterase type 5 (PDE5), which leads to increased levels of nitric oxide. Nitric oxide dilates blood vessels, which increases blood flow to the penis and results in an erection.

Which Neurotransmitter Is Primarily Affected by the Drug Viagra