
Sildenafil Citrate was originally developed to cure pulmonary arterial hypertension. It was during the testing of the product that test groups noted the drug was giving them erections. It was this side effect of Viagra® that encouraged Pfizer to develop the most popular drug in human history.
Although it would be unfair to compared penicillin and Viagra® in the same breath, but the truth is that Viagra® as a drug is perhaps the most purchased medicine in human history. Every year millions of dollars worth of Viagra® is sold over the counter and on the Internet
















