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A new study has found that the impotence drug Viagra could ramp up the sex lives of women who take it, just as it has done for men. The 12-week study focused on 202 post-menopausal or post-hysterectomy women who complained of female sexual arousal disorder.
In most men, Viagra becomes effective about half an hour after taking it. Some men have found it effective in as little as a quarter-hour, while others donât notice an effect for 45 minutes to an hour, according to manufacturer Pfizerâs website Viagra.com.Viagraâs effects generally last around four hours, with maximum effectiveness approximately two hours after taking it.ome men have found it effective in as little as a quarter-hour, while others donât notice an effect for 45 minutes to an hour, according to manufacturer Pfizerâs website Viagra.com. Viagraâs effects generally last around four hours, with maximum effectiveness approximately two hours after taking it.