Fildena 25 mg contains Sildenafil citrate, a medication used to treat erectile dysfunction (ED) in men. It belongs to a class of drugs called PDE5 inhibitors, which work by increasing blood flow to the penis to help achieve and maintain an erection during sexual activity. During sexual stimulation, the body releases nitric oxide (NO) in the penile tissue. Nitric oxide activates cGMP (cyclic guanosine monophosphate), which relaxes smooth muscles in the blood vessels of the penis. This relaxation allows blood to flow into the erectile tissue, causing an erection. Normally, the enzyme PDE5 breaks down cGMP, which ends the erection.
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