Black Cenforce 200 Official: Effective Dose For ED Cause | Cenforce 200mg contains sildenafil citrate, a phosphodiesterase type 5 (PDE5) inhibitor. This active ingredient works by increasing blood flow to the penile region, which helps to achieve and maintain a firm erection during sexual stimulition. The effects of Cenforce 50mg usually start within 30 to 60 minutes after consumption.