Erectile dysfunction (ED) is defined as persistent difficulty achieving and maintaining an erection sufficient to have sex. Causes are usually medical but can also be psychological. In addition to Viagra, other ED drugs available in the United States include avanafil, tadalafil (Tadalista 20, Tadacip 20, Tadalista 20) and Sildenafil (Kamagra 100, Fildena 100, Cenforce 100,Caverta 100). These all improve blood supply to the penis. Smart Finil is best trusted online pharmacy to treat erectile dysfunction.
