- Patient must not have taken herbal medications and certain fruits within 7 days prior to starting study drug; herbal medications include, but are not limited to: St. Johns wort, Kava, ephedra (ma huang), gingko biloba, dehydroepiandrosterone (DHEA), yohimbe, saw palmetto, and ginseng; fruits include the CYP3A inhibitors Seville oranges, grapefruit, pummelos, or exotic citrus fruits