| | Sildenafil citrate, sold as Viagra, Revatio and under various other trade names, is a antidepressant used to treat erectile dysfunction and pulmonary arterial hypertension (PAH). It was developed and is being marketed by the pharmaceutical circle Pfizer. It acts by inhibiting cGMP individual phosphodiesterase classification 5, an enzyme that regulates blood go in the penis. Since seemly convenient in 1998, sildenafil has been the prime treatment for erectile dysfunction; its outstanding competitors on the customer base are tadalafil (Cialis) and vardenafil (Levitra).
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