Malegra 120 mg is a medication used to treat erectile dysfunction (ED) in men. Erectile dysfunction is a condition characterized by the inability to achieve or maintain an erection sufficient for sexual intercourse. Malegra 120 mg contains sildenafil citrate, which is a phosphodiesterase type 5 (PDE5) inhibitor. PDE5 inhibitors work by increasing blood flow to the penis, allowing for a firm and lasting erection. Sildenafil citrate, the active ingredient in Malegra 120 mg, inhibits the PDE5 enzyme, which promotes the relaxation of the smooth muscles in the penile blood vessels. This dilation of the blood vessels helps to improve blood flow and facilitates the achievement of an erection when sexually aroused. Malegra 120 mg is usually taken orally with a glass of water, approximately 30 minutes to one hour before sexual activity. It is important to note that sexual stimulation is still required for the medication to work effectively. The effects of Malegra 120 mg typically last for about four to six hours.