Malegra 120 is a medication that contains Sildenafil Citrate, the same active ingredient found in Viagra. Sildenafil works by inhibiting the enzyme PDE5 (phosphodiesterase type 5), which helps to relax the blood vessels in the penis, thereby allowing for increased blood flow. The result is improved erectile function during sexual stimulation. Malegra 120 is a higher dose of Sildenafil Citrate (120 mg), offering a more potent effect than the standard 50 mg or 100 mg versions.