We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleEffect of St John's wort on drug metabolism by induction of cytochrome P450 3A4 enzyme.AuthorsMarkowitz JS; Donovan JL; DeVane CL; Taylor RM; Ruan Y; Wang JS; Chavin KDPublicationJAMA, 2003, Vol 290, Issue 11, p1500ISSN1538-3598Publication typearticleDOI10.1001/jama.290.11.1500