Viagra

The patent name of sildenafil citrate (5-[2-ethoxy-5-(4-methylpiperazin-1-yl)phenyl]-1-methyl-3-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-ones). Used to treat erectile dysfunction.

The drug selectively inhibits a specific phosphodiesterase that hydrolyzes cGMP, which is needed for the normal erectile function by utilizing nitric oxide.

Source | Glossary of Most Commonly Used Biomedical Terms and Concepts | Lithuanian University of Health Sciences | Academician Professor Antanas Praškevičius, Professor Laima Ivanovienė