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Filitra 20 mg contains Vardenafil, a PDE5 inhibitor that works by blocking the action of the enzyme phosphodiesterase type 5 (PDE5), which typically breaks down cyclic GMP (cGMP). By inhibiting PDE5, Filitra helps increase cGMP levels, relaxing smooth muscles and allowing increased blood flow to the penis. This process enables men to achieve and maintain an erection during sexual arousal.