Viagra (sildenafil), the first ORAL drug for impotence

Canadian men can now get Viagra (sildenafil), the first ORAL drug for impotence.

It's the first drug in a new class...phosphodiesterase type 5 inhibitors. Blocking this enzyme helps an erection occur in response to sexual stimulation.

It doesn't CAUSE an erection like Caverject (alprostadil).

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