| | Sildenafil citrate, sold as Viagra, Revatio and eye individual other have dealings names, is a drug utilized to handling of erectile dysfunction and pulmonary arterial hypertension (PAH). It was developed and is being marketed around the pharmaceutical company Pfizer. It acts on inhibiting cGMP individual phosphodiesterase variety 5, an enzyme that regulates blood stream in the penis. Since tasteful on tap in 1998, sildenafil has been the prime treatment for erectile dysfunction; its initial competitors on the customer base are tadalafil (Cialis) and vardenafil (Levitra).
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