Cialis (tadalafil) and Viagra (sildenafil) online belong to a drug class called PDE5 inhibitors, and are used to treat impotence (erectile dysfunction, ED) and enlarged.You may already know most of the names: Cialis, Levitra, Staxyn, Stendra, Viagra. housands of companies advertising online claim to offer cheapviagraoverthecounterusass.net and pills for huge discounts without needing a prescription.The Food and Drug Administration disclosed Friday that it was in discussions with the makers