Manforce tablets are used to treat erectile dysfunction (ED) in men. The active ingredient in Manforce is sildenafil citrate, the same compound found in Viagra. Sildenafil works by inhibiting the enzyme PDE5, which helps to relax the blood vessels in the penis and increase blood flow, thereby helping men achieve and maintain an erection during sexual arousal. Your doctor will determine the correct dosage based on your individual needs and medical condition. Some common side effects include headaches, flushing, dizziness, indigestion, or nasal congestion.