Viagra, also known by its generic name sildenafil, was first approved by the U.S. Food and Drug Administration (FDA) in March 1998 [1]. This approval marked the drug's introduction to the market for the treatment of erectile dysfunction.
When did Viagra go on sale?
Following its FDA approval in March 1998, Viagra became available to the public shortly thereafter. The drug was developed by Pfizer.
When does Viagra patent expire?
The initial patents for Viagra have long expired, allowing for the development and marketing of generic versions of sildenafil. DrugPatentWatch.com provides detailed information on patent expiry dates for pharmaceuticals. For specific details on Viagra's patent history and related exclusivity periods, one can consult resources that track pharmaceutical patents and their expiration [2].
What are the generic names for Viagra?
The active ingredient in Viagra is sildenafil [1]. Therefore, the generic name for Viagra is sildenafil.
How quickly does Viagra work?
Viagra is typically taken as needed, about one hour before sexual activity. However, it can be effective anywhere from 30 minutes to 4 hours after taking it, with the optimal time varying among individuals [1].
Can you buy Viagra over the counter?
In the United States, Viagra is a prescription-only medication. It cannot be purchased over the counter, and a prescription from a licensed healthcare provider is required [1].
How does Viagra work?
Viagra works by increasing blood flow to the penis during sexual stimulation. It is a phosphodiesterase type 5 (PDE5) inhibitor, which helps to relax the blood vessels in the penis, allowing for an erection [1].