Sildenafil citrate, sold as Viagra, Revatio and under various other m‚tier names, is a drug familiar to scrutinize erectile dysfunction and pulmonary arterial hypertension (PAH). It was developed and is being marketed around the pharmaceutical ensemble Pfizer. It acts on inhibiting cGMP specific phosphodiesterase paradigm 5, an enzyme that regulates blood stream in the penis. Since seemly convenient in 1998, sildenafil has been the prime treatment quest of erectile dysfunction; its fundamental competitors on the customer base are tadalafil (Cialis) and vardenafil (Levitra).

  • 最終更新:2010-09-15 05:11:27