Sildenafil Citrate, the active ingredient in Cenforce 25 mg, is a PDE5 inhibitor. It works by blocking the enzyme phosphodiesterase type 5 (PDE5), which helps to increase the levels of a substance called cyclic GMP (cGMP) in the ****. This leads to relaxation of the smooth muscles and increased blood flow, making it easier to achieve and maintain an erection when ****ually aroused.
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