How three of them works? Sildenafil is a generic name for Viagra, Tadalafil is a generic name for Cialis, and Vardenafil is a generic name for Levitra . Each of these drugs works in much the same way and comes in a same class of drugs called PDE-5 inhibitors. Sildenafil contains the same active ingredient as Viagra (sildenafil citrate), and works […]
