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Malegra 120 mg is a medication used to treat erectile dysfunction (ED) in men. It contains sildenafil citrate, which is the active ingredient found in Viagra. Sildenafil belongs to a class of drugs known as PDE5 inhibitors, which work by increasing blood flow to the penis during sexual stimulation, helping men achieve and sustain an erection. Sildenafil works by inhibiting the enzyme phosphodiesterase type 5 (PDE5), which is responsible for breaking down cyclic guanosine monophosphate (cGMP) in the penis. By blocking PDE5, sildenafil allows cGMP levels to rise, leading to the relaxation of smooth muscle in the blood vessels and increased blood flow to the penis.