A substance that is used to treat erectile dysfunction. Viagra relaxes the smooth muscle of the penis to allow increased blood flow and erection. It belongs to the family of drugs called phosphodiesterase inhibitors. Also called sildenafil.
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Sildenafil citrate, sold under the name Viagra, is a drug used to treat male erectile dysfunction (impotence), developed by the pharmaceutical company Pfizer. The pills are blue with the words "Pfizer" on one side and "VGR xx" (with xx being either 25, 50 or 100 as the dose of that pill in milligrams) on the other.
Define: viagra