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Morphine metabolism in children.
Author(s) -
Choonara IA,
McKay P,
Hain R,
Rane A
Publication year - 1989
Publication title -
british journal of clinical pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.216
H-Index - 146
eISSN - 1365-2125
pISSN - 0306-5251
DOI - 10.1111/j.1365-2125.1989.tb03548.x
Subject(s) - glucuronidation , morphine , urine , glucuronide , metabolism , medicine , pharmacokinetics , pharmacology , endocrinology , chemistry , anesthesia , biochemistry , microsome , enzyme
1. The metabolism of morphine was studied in 12 children and nine premature neonates on a continuous infusion of morphine (10‐360 micrograms kg‐1 h‐1). 2. The mean plasma clearance of morphine was significantly higher in children than neonates (25.7 and 4.7 ml min‐1 kg‐1, respectively) (P less than 0.01). 3. All the neonates and children had detectable concentrations of morphine‐3‐glucuronide (M3G) in plasma. All the children and five neonates had detectable concentrations of morphine‐6‐glucuronide (M6G) in plasma or urine. 4. The M3G/morphine ratios in plasma and urine, and M6G/morphine ratios in urine were significantly higher in children than neonates (P less than 0.01), suggesting that morphine glucuronidation capacity is enhanced after the neonatal period. 5. There was no difference in the M3G/M6G ratio in children and neonates, indicating a parallel development of both glucuronidation pathways.