What is Viagra?
Viagra was the first prescription medication recognized worldwide to be successful in the treatment of male erectile dysfunction (impotence).
Viagra has been initially created to treat hypertension (high blood pressure) and angina pectoris (a form of ischaemic cardiovascular disease). However, penile erection enhancing effects were noticed during the trial studies. The drug was patented in 1996 and approved for use by the FDA on March 27, 1998. It was a breakthrough in allowing men suffering from ED to enjoy normal sexual relations.
The active ingredient in Viagra is Sildenafil Citrate, the substance that is activated when a man is sexually stimulated and which causes an erection.
The chemical formula of is Sildenafil Citrate is C22 H30 N6 O4 S with the following molecular structure:
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