Malegra 25 contains sildenafil citrate, a medication primarily used to treat erectile dysfunction (ED) in men. Sildenafil works by inhibiting the enzyme phosphodiesterase type 5 (PDE5), which regulates blood flow in the penis. Malegra 25 mg contains 25 milligrams of sildenafil citrate. It's a lower dose compared to higher strengths like 50 mg or 100 mg. The appropriate dosage of Malegra should be determined by a healthcare provider based on individual response, tolerability, and medical history.