Manforce 100 mg Tablet belongs to the group of medicines called phosphodiesterase type-5 (PDE 5) inhibitors, primarily used to treat erectile dysfunction (impotence) in adult men and pulmonary arterial hypertension (high blood pressure in the lungs) in adults to improve the ability to exercise and to slow down clinical worsening. Manforce 100 mg Tablet works by relaxing the blood vessels in the penis, thereby allowing the blood to flow into the penis when the person is sexually excited. However, Manforce 100 mg Tablet helps the person to get an erection only if he is sexually stimulated. Manforce 100 mg Tablet relaxes the blood vessels, increases the blood supply to the lungs and reduces the workload of the heart. Thereby treating pulmonary hypertension.