Cenforce 120 mg tablet belongs to the PDE-5 inhibitor classification. Suffering from erectile dysfunction, person who should take Cenforce 120 mg tablets as recommended dose. Cenforce 120 mg tablet taken by mouth for about 15-30 minutes when the tablet works. In Cenforce 120 mg they are made up of chemicals sildenafil citrate that increase the level of cGMP in the body, which helps increase blood flow in the body's blood vessels.