Manforce 50 mg is a drug used to treat erectile dysfunction and pulmonary arterial hypertension. The active ingredient in Manforce 50 mg is sildenafil citrate, which is a phosphodiesterase type 5 inhibitor. Manforce 50 mg works by relaxing the blood vessels in the penis, which allows more blood to enter the penis and causes an erection. It also works by relaxing the blood vessels in the lungs, which reduces the workload of the heart and improves symptoms of pulmonary arterial hypertension.