- Female subjects of childbearing potential must use a highly effective method of contraception to prevent pregnancy for 4 weeks before randomization and must agree to continue to practice adequate contraception for the duration of their participation in the trial (up to the last Safety Follow-Up Visit). For the purposes of this trial, women of childbearing potential are defined as "All female subjects after puberty unless they are post-menopausal for at least 2 years or are surgically sterile." Highly effective contraception is defined as 2 barrier methods (eg, female diaphragm and male condoms); or 1 barrier method with at least one of the following: spermicide, a hormonal method, or an intrauterine device. Note that because mycophenolate affects the metabolism of oral contraceptives and may reduce their effectiveness, women receiving mycophenolate who are using oral contraceptives for birth control should employ an additional contraceptive method (for example, male or female barrier method).