How Does Viagra® Work

Question

How does Viagra® work?
A) Stops blood flow to the penis
B) Constricts the blood vessels in the penis
C) Inhibits the breakdown of cGMP
D) Stimulates the area of the brain associated with sexual drive

Accepted Answer

Viagra® works by inhibiting the enzyme phosphodiesterase type 5 (PDE5), which leads to the prevention of cGMP breakdown. This results in increased blood flow to the penis, facilitating an erection.