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Viagra contains sildenafil, which belongs to a class of phosphodiesterase type 5 (PDE5) inhibitors. Viagra is the well-known brand-name version of this medication.
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Viagra is an effective drug for treating male erectile dysfunction, but it targets sexual performance, not sexual arousal. There …
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Viagra works at its best within a few hours after it’s taken. In most people, the drug is most effective about 1 hour after it’s taken. Over time, Viagra is slowly …