| | Sildenafil citrate, sold as Viagra, Revatio and under different other patrons names, is a drug utilized to scrutinize erectile dysfunction and pulmonary arterial hypertension (PAH). It was developed and is being marketed by the pharmaceutical ensemble Pfizer. It acts nigh inhibiting cGMP specific phosphodiesterase paradigm 5, an enzyme that regulates blood go in the penis. Since becoming readily obtainable in 1998, sildenafil has been the prime treatment an eye to erectile dysfunction; its outstanding competitors on the customer base are tadalafil (Cialis) and vardenafil (Levitra).
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