7. Women who are pregnant or breast-feeding. Women of childbearing potential with either a positive serum pregnancy test at screening, a positive urine pregnancy test at the beginning of any cycle, or no pregnancy test. Women of childbearing potential unless using two forms of contraception, one of which must be a barrier method. Postmenopausal women must be amenorrheic for at least 12 months to be considered of non-childbearing potential.