Official Cenforce 200 (200mg Sildenafil Black Pill) Cure ED | Cenforce 200mg is one of the most popular and widely used medications to treat erectile dysfunction. To use Cenforce 200 mg, it is best to take the tablet with a full glass of water, approximately one hour before you plan to engage in sexual intercourse. Cenforce can take up to thirty minutes to start working, so it is important to take it ahead of time so that it can start working when needed.