what is the work of viagra
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VIAGRA works for men with erectile dysfunction by increasing blood flow to the penis so you can get and keep an erection hard enough for sex. ... VIAGRA works only when you are sexually stimulated. You may take it up to 4 hours before sexual activity.
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VIAGRA works for men with erectile dysfunction (ED) by increasing blood flow to the penis so you can get and keep an erection hard enough for sex.
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