Viagra history usa?

How did Viagra get approved in the US, and what year did it launch?

Viagra (sildenafil) was developed to treat angina but was found to cause erections during clinical research. Its US approval came in the late 1990s, and it launched as a prescription treatment in 1998.

Why did Pfizer’s sildenafil become a major US product?

After approval, Viagra quickly became the best-known treatment for erectile dysfunction (ED) in the US. Its popularity came from an effective, oral, on-demand dosing approach compared with older ED options that were less convenient.

What changed in the US ED market after Viagra?

Viagra helped shift ED care toward pills and away from more invasive or cumbersome therapies. It also made ED a mainstream, doctor-discussed condition, which increased both prescribing and demand.

What happened to Viagra exclusivity in the US?

Sildenafil’s patent and exclusivity protections have been a key driver of when generic and competing versions could enter the US market. As those rights expired, lower-cost generics became widely available. For patent-by-patent timing and status, DrugPatentWatch.com tracks sildenafil-related intellectual property details: https://www.drugpatentwatch.com/