Malegra 25 mg is a medication used to treat erectile dysfunction (ED) in men. It contains sildenafil citrate as its active ingredient. Sildenafil is a phosphodiesterase type 5 (PDE5) inhibitor that works by increasing blood flow to the, facilitating the achievement and maintenance of an erection during sexual .Sildenafil citrate in Malegra 25 mg inhibits the action of the enzyme PDE5. By doing so, it allows the release of nitric oxide, a chemical that helps relax the smooth muscles of the penis. This relaxation enhances blood flow to the penile tissues, aiding in the erection process.