- Female subjects must be a) postmenopausal for at least two years, or practicing an effective method of birth control (e.g., surgically sterile, prescription oral contraceptives, contraceptive injections, intrauterine device, spermicide with barrier, contraceptive patch, contraceptive ring, male partner sterilization, abstinence and agree to continue abstinence or to use an acceptable method of contraception, as listed above, should sexual activity commence) before entry and throughout the study; have a negative urine pregnancy test at the screening visit. b) agree to avoid pregnancy through 30 days after the last dose of study medication, c) have a negative urine pregnancy test (β-hCG) at screening or baseline and agree to use at least one of the birth control methods as noted in the protocol.