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: Viagra helps men with erectile dysfunction (ED) achieve and maintain an erection by increasing blood flow to the penis when sexually stimulated .

: 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

: 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 .

For official product details and safety information, you can visit the or consult the Mayo Clinic's guide to ED medications .