- Non-nursing, female subjects of child bearing potential, who are using an acceptable form of birth control: total abstinence, oral (birth control pills), intravaginal: (e.g. NuvaRing®), implantable (e.g. Norplant®), injectable (e.g. Depo-Provera®) or transdermal (e.g. Ortho Evra®) contraception; intrauterine device (IUD); double-barrier (diaphragm or condom with spermicidal gel or foam); for two months prior to study enrollment or a vasectomized partner. All female subjects of child bearing potential must have undergone an in-office urine pregnancy test, with a negative result, prior to being randomized to receive study drug. In addition, women of childbearing potential must have agreed to a have urine pregnancy test at Day 42 and at the end of the study (Day 84). Females not of childbearing potential due to menopause must have been postmenopausal for at least one year. Male subjects must be willing to not attempt to conceive a child during the participation in the study. Females utilizing oral contraception must be willing to utilize an appropriate secondary form of contraception during the study.