From Longman Dictionary of Contemporary EnglishViagraVi‧ag‧ra /vaɪˈæɡrə/ noun [uncountable] trademark a drug that helps men to have an erection
Examples from the Corpus
Viagra• The judgment does not affect Pfizer's patent for sildenafil citrate, the main ingredient of the anti-impotence drug Viagra.• What are some possible side effects of Viagra? 