What is Viagra? Viagra, with the active ingredient sildenafil citrate, is a prescription medication widely recognized for treating erectile dysfunction (ED)—the inability to achieve or maintain an erection sufficient for sexual activity. Approved by the FDA in 1998, Viagra has become one of the most popular and effective treatments for ED.
How Viagra Works Viagra belongs to a class of medications called phosphodiesterase type 5 (PDE5) inhibitors. During sexual arousal, nitric oxide is released in the penile tissues, stimulating the production of cyclic guanosine monophosphate (cGMP). This chemical relaxes smooth muscles and allows blood to flow freely into the penis, resulting in an erection. PDE5 enzymes typically break down cGMP, leading t
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