Fildena is a medication primarily used to treat erectile dysfunction (ED) in men. Its active ingredient is sildenafil citrate, a phosphodiesterase type 5 (PDE5) inhibitor. Sildenafil works by increasing blood flow to the penis during sexual stimulation, helping men achieve and maintain an erection. Fildena inhibits the PDE5 enzyme, which normally breaks down cyclic GMP (cGMP). cGMP relaxes smooth muscles in the penile blood vessels, allowing them to widen and fill with blood. This mechanism is dependent on sexual stimulation; it does not cause spontaneous erections.
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