the obtained antipropulsive/antidiarrheal potency ratios varied from 0.71 to greater than 552 [ pethidine ( oral ed50 's in mg/kg : 21.5/30.2 ) , fentanyl ( 0.77/0.49 ) , dextromoramide ( 5.39/2.90 ) , methadone ( 14.2/6.38 ) , codeine ( 98.4/10.8 ) , morphine ( 56.6/5.21 ) , diphenoxylate ( 8.15/0.54 ) , nufenoxole ( 74.7/1.72 ) , difenoxin ( 7.10/0.16 ) , loperamide oxide ( greater than 160/0.34 ) and loperamide ( greater than 160/0.29 ) ] .
C0009214
codeine
C0026549
morphine