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Viagra is the first released drug to treat male impotence, Since it's release by Pfizer in late 2000 it became one of the top 10 selling drugs worldwide and the best selling medication to treat erectile dysfunction, followed by
Cialis which is ranked as number two selling drug.
Viagra should be taken orally, 30 minutes prior to engaging in a sexual interaction, Viagra will not cause an automatic erection, a sexual stimulation must occur in order to achieve an erection, the drug's influence lasts for aproximalty 4 to 5 hours.
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