The medicine Cenforce 50, is intended for men between ages 18 and 65 to achieve an erection. Cenforce 50 commonly known as sildenafil, the medicine works by increasing erectile function. The primary ingredient of the drug is sildenafil citrate. This is accomplished by increasing the flow of blood to the stimulation site, the penis, and is useful in treating impotence and erectile dysfunction. Before engaging in sexual activity, it is recommended that you take Cenforce 50 (sildenafil 20 mg) 30 to 60 minutes in advance. The drug begins to work after about 30 minutes.