Subjects using hormonal contraceptives were on a stable dose for 3 months prior to dosing, or they agreed to also use a barrier method of birth control from screening through completion of the study. Subjects having an intrauterine device (IUD) must have had the IUD in place for at least 2 months prior to dosing, or they agreed to also use a barrier method of birth control from screening through completion of the study. For other forms of birth control, the subject had used the method at least 2 weeks prior to screening and agreed to use the method through completion of the study.