A Cenforce tablet is a prescription medicine that can treat impotence in men. It can be purchased in 100 mg, 150 mg, or 200 mg doses, but you should consult your doctor before changing your dose. The recommended starting dosage of Cenforce is 50 milligrams, which is taken once daily. It can last for up to four hours before the effects wear off. However, the drug can cause some side effects, including headaches, nausea, and dizziness.