| | Sildenafil citrate, sold as Viagra, Revatio and under different other trade names, is a antidepressant used to scrutinize erectile dysfunction and pulmonary arterial hypertension (PAH). It was developed and is being marketed past the pharmaceutical circle Pfizer. It acts next to inhibiting cGMP associated with phosphodiesterase type 5, an enzyme that regulates blood go in the penis. Since tasteful available 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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