- Any drug, including prescription and non prescription medications (including herbal products, or vitamin supplements) beginning 14 days prior to the first dose of study drug and throughout the study. Acetaminophen (up to 2 g per 24 hour period) may be permitted during the study; however acetaminophen will not be administered 4 hours before and after dosing. Thyroid hormone replacement medication may be permitted if subject has been on same stable dose for last 3 months prior to first study drug administration.