Caverta 100 mg is a medicine used to males for the treatment of erectile dysfunction (ED). Sildenafil citrate, a highly specific inhibitor of phosphodiesterase type 5 (PDE5), is included. Caverta 100 works by suppressing phosphodiesterase type 5, which in turn relaxes the smooth muscles of blood vessels in the penis, increasing blood flow, and making it easier to gain and hold a rock hard erection when sexually stimulated.