group 1 consisted of 28 babies whose mothers had received no narcotics during labor , group 2 of 33 babies whose mothers had received meperidine hydrochloride alone during labor , and group 3 of 40 babies whose mothers had received meperidine followed by 0.4 mg of naloxone hydrochloride intravenously approximately 15 minutes before delivery .
C0353148
meperidine hydrochloride
C0025376
meperidine