TY - RPRT TI - St. John's wort: effect on CYP2D6 activity using dextromethorphan-dextrorphan ratios. AU - C A Roby AU - D A Dryer AU - A H Burstein PY - 2001 DO - 10.1097/00004714-200110000-00013 UR - https://pubmed.ncbi.nlm.nih.gov/11593081/ ID - 11593081 ER -