| | Sildenafil citrate, sold as Viagra, Revatio and under individual other mＵier names, is a medicament toughened to treat erectile dysfunction and pulmonary arterial hypertension (PAH). It was developed and is being marketed past the pharmaceutical ensemble Pfizer. It acts nigh inhibiting cGMP spelled out phosphodiesterase paradigm 5, an enzyme that regulates blood spout in the penis. Since enhancing on tap in 1998, sildenafil has been the prime treatment recompense erectile dysfunction; its initial competitors on the market are tadalafil (Cialis) and vardenafil (Levitra).
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