Malegra 120 mg contains Sildenafil Citrate, a medication commonly used to treat erectile dysfunction (ED). Sildenafil works by relaxing blood vessels and increasing blood flow to the penis during sexual arousal, helping to achieve and maintain an erection. Sildenafil causes blood vessel dilation, which can lower blood pressure. In people with certain heart conditions, this drop in blood pressure may cause dizziness, fainting, or worsen existing heart problems.