Fildena 150 mg contains sildenafil citrate, which is a phosphodiesterase type 5 (PDE5) inhibitor. PDE5 is an enzyme that is responsible for breaking down cGMP, a chemical that relaxes the smooth muscles in the penis. When PDE5 breaks down cGMP, the blood vessels in the penis constrict, making it difficult to achieve and maintain an erection. By inhibiting PDE5, Fildena 150 mg helps to increase blood flow to the penis, allowing for a firmer and longer-lasting erection.
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