Cenforce 100 is a medication used to treat erectile dysfunction (ED) in men. It contains the active ingredient sildenafil citrate, which works by relaxing the blood vessels, allowing for increased blood flow and improved erections. Cenforce 100 is typically taken orally, about 30 minutes to an hour before the activity. It should not be taken more than once daily and only as directed by a healthcare provider. Common side effects of Cenforce 100 may include headache, dizziness, flushing, and upset stomach. Talking to a healthcare provider before taking this medication is important, especially if you have a history of heart problems or other medical conditions.