5. Women must be surgically sterile, at least two years postmenopausal, or, if of childbearing potential, be using a medically accepted method of birth control and agree to continue use of this method for at least 30 days after the last dose of study drug (i.e. barrier method with spermicide, steroidal contraceptive [oral and implanted, including Depo-Provera, contraceptives must be used in conjunction with a barrier method], or intrauterine device [IUD]).