Manforce 50 mg is a prescription medicine commonly used to treat erectile dysfunction (ED) in adult men. It contains sildenafil, a phosphodiesterase type 5 (PDE5) inhibitor. Sildenafil helps increase blood flow to the penis during sexual stimulation, making it easier to achieve and maintain an erection. An important precaution is that sildenafil must not be taken with nitrate medicines, such as nitroglycerin, because the combination can cause a potentially dangerous drop in blood pressure. Tell your doctor about heart disease, low blood pressure, blood-pressure medicines, alpha-blockers, and any other ED treatments you use.