Fildena 100 contains Sildenafil Citrate as its active ingredient. Sildenafil Citrate is a phosphodiesterase type 5 (PDE-5) inhibitor, which means it helps relax the muscles in the blood vessels of the penis, allowing for increased blood flow. This increased blood flow is essential for achieving and maintaining an erection during sexual stimulation.

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Understanding the Mechanism of Action
When a man is sexually aroused, the release of nitric oxide (NO) in the penis triggers the production of cyclic guanosine monophosphate (cGMP).