In: LiverTox: Clinical and Research Information on Drug-Induced Liver Injury [Internet]. Bethesda (MD): National Institute of Diabetes and Digestive and Kidney Diseases; 2012.
Levorphanol is a synthetic opioid which is used as a narcotic analgesic for moderate-to-severe pain or as a preoperative medication. Levorphanol has not been linked to serum enzyme elevations during therapy or to clinically apparent liver injury.