Viagra (sildenafil), the first ORAL drug for impotence
April 1999
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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