Sildenafil is a medicine available in pharmacies and over the counter used to aid males in treating erectile dysfunction. Erectile dysfunction, or male impotence, is when a man is unable to maintain an erection firm enough leading up to or during sexual intercourse. Sildenafil comes in the form of a tablet in strengths of 25mg, 50mg and 100mg. The popular, brand name for this particular drug is known as Viagra and is used by many men globally to help their impotence when in sexual situations.

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