to determine the efficacy of epidural morphine during labor and delivery , 40 healthy parturients who requested epidural analgesia were randomly given either a single injection of morphine sulfate ( 2 mg , n = 9 ; 5 mg , n = 10 ; or 7.5 mg , n = 11 ) or 0.5 % bupivacaine ( n = 10 ) .
C0026549
morphine
C0066814
morphine sulfate