Viagra is a well-known brand name for the medication sildenafil, which is commonly prescribed to treat erectile dysfunction (ED). As a phosphodiesterase type 5 (PDE5) inhibitor, Viagra works by increasing blood flow to the penis during sexual stimulation, facilitating the achievement and maintenance of an erection. It is crucial to note that Viagra does not cause spontaneous erections; sexual arousal is still required for it to be effective. Typically taken about 30 minutes to an hour before sexual activity, Viagra’s effects can last for around four to six hours.

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