Cialis, classified as a PDE-5 inhibitor, is widely renowned for effectively treating Erectile Dysfunction (ED). Its active ingredient, Tadalafil, chosen for its potency, stands among the four scientifically approved medications—sildenafil, vardenafil, and avanafil—recognized for repairing erectile tissue damage. Tadalafil stands out as the preferred first-line oral treatment due to its rapid onset and prolonged efficacy in restoring erectile function.