- Female participants must be postmenopausal (after the time in life when a woman stops having a menstrual period) for at least 1year, surgically sterile, or practicing an effective method of birth control (e.g., prescription oral contraceptives[compounds, usually hormonal, taken orally in order to block ovulation and prevent the occurrence of pregnancy], contraceptive injections [chemical substances that prevent or reduce the probability of pregnancy], intrauterine device [contraceptive devices placed high in the uterine fundus], double-barrier method, contraceptive patch, male partner sterilization) before entry and throughout the study; have a negative urine pregnancy test at baseline