Kamagra Effervescrntworks through the action of Sildenafil Citrate, which inhibits the enzyme PDE5 in the body. This enzyme normally breaks down a molecule called cyclic GMP, which is responsible for relaxing the smooth muscles in the blood vessels of the penis. By inhibiting PDE5, Sildenafil helps increase the levels of cyclic GMP, thereby enhancing blood flow to the penis when sexually stimulated, which results in a firm and sustained erection.