Cenforce d is mainly composed of sildenafil citrate and dapoxetine. Cenforce d is a cost-effective alternative to Viagra. Tablet is a prescription medicine use to treat erectile dysfunction (impotence) in men. It works by increasing blood flow to the penis. This helps men to get or maintain an erection. It belongs to a group of medicines known as phosphodiesterase type 5 (PDE 5) inhibitors.