<p>Sildenafil citrate, the active ingredient in Cenforce 50, is a medicine. Sildenafil citrate is a PDE5 inhibitor that is used to treat erectile dysfunction (ED) in males. Cenforce 50 should be taken 30 minutes to an hour before sexual activity. The medicine does not generate an erection on its own; it requires sexual stimulation to act. Cenforce 50 effects can continue for 4 to 6 hours, during which time a man may find it easier to get and maintain an erection while sexually aroused.</p>