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What Is Viagra ?

Sildenafil citrate also known as Viagra is a medicine used to treat erectile dysfunction and pulmonary hypertension.

It was developed and is marketed by the pharmaceutical company Pfizer.

It works by inhibiting specific phosphodiesterase type 5, an enzyme that regulates blood flow to the penis.

Since becoming available in 1998, sildenafil has been the main treatment for erectile dysfunction, its main competitors in the market are Cialis and Levitra.

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