- Females of childbearing potential (all women under the age of 40) must agree to use medically approved contraception and must agree to continue using this method for at least three months after enrollment. Females of childbearing potential on hormonal contraception must be stable on hormonal contraception and must agree to use this method of contraception for at least three months after enrollment. Acceptable forms of medically approved contraception include the use of: oral contraceptives, injectable contraceptives (i.e., Depo-Provera), transdermal contraceptives or double barrier method.