on the other hand , codeine ( 40 mg/kg , s.c. ) and pethidine ( 100 mg/kg , s.c. ) administration suppressed the abrupt withdrawal signs of morphine-dependent mice that were treated with morphine-admixed food , while the withdrawal signs were completely suppressed in mice administered only 5 mg/kg morphine .
C0009214
codeine
C0026549
morphine