Fildena 25 mg is a medication belonging to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors. It contains the active ingredient sildenafil citrate, which is also found in other well-known ED medications like Viagra. Fildena 25 mg is specifically formulated to provide a lower dosage option for men experiencing mild to moderate ED, offering a safe and effective solution for improving erectile function. The mechanism of action of Fildena 25 mg revolves around its ability to promote vasodilation and inhibit the enzyme PDE5. When a man is sexually aroused, nitric oxide is released in the erectile tissue of the penis, leading to the activation of an enzyme called guanylate cyclase. This enzyme stimulates the production of cyclic guanosine monophosphate (cGMP), which relaxes the smooth muscles and dilates the blood vessels in the penis, allowing for increased blood flow.