Malegra 25 mg is a medication used to treat erectile dysfunction (ED) in men. The active ingredient in Malegra 25 mg is sildenafil citrate, which is a phosphodiesterase type 5 (PDE5) inhibitor. Sildenafil citrate works by increasing blood flow to the penis during sexual stimulation, facilitating the ability to achieve and maintain an erection. Common side effects may include headache, facial flushing, indigestion, nasal congestion, and dizziness. Serious side effects are rare but can include sudden vision or hearing loss, chest pain, and priapism (a prolonged and painful erection).