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Viagra (sildenafil) is a medication used to treat erectile dysfunction (ED) by enhancing blood flow to the penis. It works by inhibiting the enzyme phosphodiesterase type 5 (PDE5), which helps relax blood vessels and allows for a firmer erection in response to sexual stimulation. Viagra is typically taken on-demand, about 30 minutes to an hour before sexual activity, and its effects can last for up to four hours. Common side effects include headaches, flushing, indigestion, and nasal congestion. It should not be combined with nitrates, as this can cause a dangerous drop in blood pressure. It should be used under medical supervision.
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