8. If sexually active female of childbearing potential, be willing to use an acceptable method of birth control during the study. Acceptable methods include oral contraceptives (the pill), IUDs, contraceptive implants under the skin, contraceptive rings or patches or injections, diaphragms with spermicide, and condoms with spermicide. Surgical sterilization by tubal ligation or hysterectomy is acceptable. Women of child bearing potential are defined as women who are <12 months since their last menstrual cycle prior to screening and have not experienced surgical menopause.