when administered intraperitoneally , morphine , hydromorphone , ethylmorphine , l-alpha-acetylmethadol ( laam ) , and meperidine all caused a significant decrease in hepatic gsh concentrations in male mice while codeine , methadone , butorphanol , nalbuphine , and pentazocine were without effect even at doses up to those approaching acute lethality .
C0026549
morphine
C0009214
codeine