Cialis and Viagra, as well as their generic equivalents, belong to a class of drugs referred to as PDE5 inhibitors. These medications work by inhibiting the actions of an internal enzyme called ...

(Bloomberg) -- Generic versions of erectile dysfunction drugs Viagra and Cialis, among other medications, were allowed on the US market using potentially problematic data that call into question ...

The day after Pfizer Inc’s patent for Viagra expired in Brazil, Carlos Sanchez flooded pharmacies with his generic erectile dysfunction pills. It was a day his army of lawyers, researchers and ...