Sildigra 100 mg is a medication used to treat erectile dysfunction (ED) in men. It contains sildenafil citrate, which is a phosphodiesterase type 5 (PDE5) inhibitor. Sildenafil works by increasing blood flow to the penis during sexual stimulation, facilitating an erection. Sildenafil citrate, the active ingredient in Sildigra, inhibits the enzyme phosphodiesterase type 5 (PDE5). By inhibiting PDE5, sildenafil allows for the accumulation of cyclic guanosine monophosphate (cGMP) in the smooth muscle cells of the penis. This leads to relaxation of the smooth muscles and increased blood flow to the penile tissues, facilitating an erection.