Malegra 25 mg is a medication used to treat erectile dysfunction (ED) in men. It contains the active ingredient sildenafil citrate, which is a phosphodiesterase type 5 (PDE5) inhibitor. Sildenafil works by increasing blood flow to the penis, which helps men achieve and maintain an erection when sexually aroused. Malegra 25 mg is one of the available dosages of sildenafil.