In Brief: Viagra may help with cold feet and hands
In Brief
The erectile dysfunction (ED) drugs all work in pretty much the same way. They relax constricted blood vessels in the penis by inhibiting an enzyme (phosphodiesterase type 5) crucial to the complicated business of maintaining proper blood vessel "tone." The spongy erectile tissue in the penis swells when blood flows in through dilated (opened) blood vessels. The erection is maintained by swollen tissue pressing on veins so the blood can't escape.
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