Malegra 100 mg is a prescription medication used to treat erectile dysfunction (ED) in men. It contains Sildenafil Citrate, the same active ingredient found in Viagra, which is a PDE5 inhibitor. Malegra 100 mg helps men achieve and maintain an erection by enhancing blood flow to the penis during sexual stimulation. Sildenafil works by inhibiting the phosphodiesterase type 5 (PDE5) enzyme. This action promotes the relaxation of smooth muscles and dilates blood vessels in the penis, leading to improved blood flow and a firmer erection during sexual arousal.