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: It typically starts working within 30 to 60 minutes , though it can work as early as 12 minutes for some . It is most effective when taken on an empty stomach about an hour before sexual activity .

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Before taking Viagra, discuss your health with a provider, especially if you have heart problems or take nitrates for chest pain, as the combination can cause a dangerous drop in blood pressure . Common side effects may include headaches, flushing, or an upset stomach. : It typically starts working within 30 to

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: Sildenafil is the active ingredient in Viagra and is available as a generic medication . Generic sildenafil is medically equivalent to Pfizer's brand-name Viagra but is usually significantly more affordable . Safety and Side Effects