Sildenafil Citrate, the Classic PDE5 Inhibitor

In 1988, a new class of drugs was heralded by the release of sildenafil citrate, an orally administered, potent, and selective phosphodiesterase type 5 (PDE5) inhibitor. These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.