- Female subjects with childbearing potential should have a negative pregnancy test at Entry and should have a medically accepted method of contraception used during the entire duration of the study and for 10 weeks after the last dose of Certolizumab pegol (CZP). Medically accepted methods of contraception are: hormonal contraception for at least 2 cycles prior to Screening, intrauterine device, implant device, diaphragm with spermicide, bilateral tubal ligation, monogamous relationship with vasectomized (for at least 3 months prior to Screening) partner, or using condoms with spermicide gel. Abstinence is not an acceptable method of contraception for the study. Female subjects who are postmenopause for at least 2 years or had undergone a complete hysterectomy, bilateral tubal ligation and/ or bilateral ovariectomy, or have a congenital sterility are considered not of childbearing potential. Male subjects must agree to ensure they use adequate contraception during the study and for at least 10 weeks after the subject receives their last dose of study medication