How does Generic Viagra work? That was the first question that men from all over the work asked to their doctors when they knew that they had to initiate a drug therapy for impotence. It works like this: It increases blood flow to the penis and this mechanism causes the erection. Generic Viagra contains Sildenafil citrate. This drug substance works by inhibiting an enzyme that breaks down cGMP and expands arteries in the penis. These dilated arteries let blood enter to cause and keep penis erection How does Generic Viagra work? is not a strange question at present. Everybody can get this information by asking to his doctors about its mechanism of action or by searching information on the web. Be careful if you use the second option. Read data from reliable websites. Now, you have the answer for the first question. This is the second one: when will you see your doctor to start using Generic Viagra?