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Viagra is a medicine used to treat erectile dysfunction. Sildenafil Citrate increases blood flow to the penis to help men get an erection. At least two-thirds of men have improved erections after taking it.

This medicine is also sometimes used to treat pulmonary hypertension (high blood pressure in the blood vessels that supply the lungs).

This medicine is available on prescription and can also be bought from most pharmacies. It comes as tablets that you swallow, chewable tablets, and as a liquid that you drink.