Malegra 120 mg is marketed as a medicine for erectile dysfunction and may contain sildenafil. Sildenafil belongs to a group of medicines called phosphodiesterase type-5 (PDE5) inhibitors. It works by increasing blood flow to the penis during sexual stimulation, which can help an adult man achieve and maintain an erection. However, 120 mg of sildenafil is above the usual maximum recommended single dose of 100 mg for erectile dysfunction. A higher dose does not necessarily produce better results and may increase the risk of side effects.