- An unwillingness of male subjects to abstain from sexual intercourse with pregnant or lactating women; or an unwillingness of the male subject to use a condom/spermicide in addition to having their female partner use another form of contraception, such as: an intrauterine devise (IUD), diaphragm with spermicide, oral contraceptives, injectable progesterone, subdermal implants or a tubal ligation, if the woman could become pregnant from the first dose of study medication until completion of follow-up procedures.