| 词源 |
Viagra. This drug for the treatment of male impotence by stimulating blood flow to the penis was introduced by the Pfizer Company in 1998. Its name is said to come from Niagara Falls, which is vital and powerful, like anyone who takes Viagra. Via- gra’s generic name is sildenafil citrate (its active ingredient). The drug’s chief competitor is Levitra, which takes its name, most appropriately, from elevate. |