Viagra is a medication used to treat erectile dysfunction (ED) in men over 18 and is manufactured by Fareva Amboise. It contains the active ingredient sildenafil and is available in 25 mg, 50 mg, and 100 mg tablets.
Viagra works by relaxing the blood vessels in the penis when you are sexually aroused. This allows blood to flow more easily and strengthens an erection. It can take effect within 30 to 60 minutes and lasts 4 to 5 hours.
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