Sildisoft Tablets work by inhibiting the enzyme phosphodiesterase type 5 (PDE5), which plays a key role in regulating blood flow to the ****. When a man is ****ually aroused, the body naturally releases nitric oxide, which activates the enzyme guanylate cyclase, leading to the production of cyclic GMP (cGMP). This process causes the muscles of the blood vessels in the **** to relax, resulting in increased blood flow and, consequently, an erection.