10. Use of prescription or nonprescription drugs, vitamins and dietary supplements within 7 days or 5 half-lives (whichever is longer) prior to the first dose of study medication. Herbal supplements and hormonal methods of contraception (including oral and transdermal contraceptives, injectable progesterone, progestin subdermal implants, progesterone-releasing IUDs, postcoital contraceptive methods) and hormone replacement therapy must be discontinued 28 days prior to the first dose of study medication. Depo-Provera� must be discontinued at least 6 months prior to the first dose of study medication. As an exception, acetaminophen may be used at doses of ?1g/day. Other exceptions may be granted by a qualified member of Pfizer study management.