<qa>  What is not allowed throughout the study?10. Herbal preparations are not allowed throughout the study. These herbal medications include, but are not limited to: St. Johns wort, kava, ephedra ma huang, gingko biloba, dehydroepiandrosterone DHEA, yohimbe, saw palmetto, and ginseng. Not willing to avoid grapefruit, grapefruit juices, grapefruit hybrids, Seville oranges, pummelos, and exotic citrus fruits from 14 days prior to the dose of study medication and during the entire study due to potential CYP3A4 interaction with the study medication. Orange juice is allowed. 