Titre :
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Urinary excretion half-life of 11-Nor-9-carboxy-D9-tetrahydrocannabinol in humans
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Auteurs :
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M. A. HUESTIS ;
E. J. CONE
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Type de document :
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Périodique
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Année de publication :
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1998
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Format :
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570-576 / graph. ; tabl.
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Note générale :
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Therapeutic Drug Monitoring, 1998, 20, (5), 570-576
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Langues:
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Anglais
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Discipline :
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PRO (Produits, mode d'action, méthode de dépistage / Substances, action mode, screening methods)
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Mots-clés :
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Thésaurus mots-clés
CANNABINOIDES
;
TETRAHYDROCANNABINOL
;
URINE
;
DEPISTAGE
;
ENQUETE
|
Résumé :
|
The excretion of marijuana metabolites occurs over an extended period of time, yet few studies have been designed for accurate estimation of excretion half-lives. The authors monitored excretion of the primary urinary metabolite of marijuana, 11-nor-9-carboxy-delta9-tetrahydrocannabinol (THCCOOH), by gas chromatography-mass spectrometry in a controlled clinical study of marijuana smoking that included measurement of the drug in each urine void collected during the 3-week study. Terminal excretion half-lives of THCCOOH were determined in six healthy male subjects with histories of marijuana smoking; the study was conducted on the clinical research unit of a major medical institution. Subjects smoked a single marijuana cigarette (placebo, 1.75% or 3.55% THC) each week. Urine specimens (N=953) were analyzed under blind conditions for THCCOOH by gas chromatography-mass spectrometry. Mean+/-SEM half-lives calculated by the amount remaining to be excreted method after the low and high doses were 31.5+/-1.0 hours (range, 28.4 to 35.3 hours) and 28.6+/-1.5 hours (range, 24.9 to 34.5 hours), respectively, when a 7-day monitoring period was used. The amounts of THCCOOH excreted over a 7-day period were 93.9 +/-24.5 microg (range, 34.6 to 171.6 microg) and 197.4+/-33.6 microg after the low- and high-dose sessions. Longer half-lives, 44.3 to 59.9 hours, were obtained with a 14-day sample collection. This study documents the prolonged excretion of THCCOOH in urine and emphasizes the importance of study design in the precise estimation of terminal excretion half-lives. A sensitive analytical method and a prolonged specimen collection period are important study considerations in the monitoring of marijuana excretion.
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Domaine :
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Drogues illicites / Illicit drugs
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Refs biblio. :
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22
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Affiliation :
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Chemistry and Drug Metabolism, Intramural Research Program, National Institute on Drug Abuse, National Institutes of Health, Baltimore, Maryland, USA
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Centre Emetteur :
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13 OFDT
|
Cote :
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A01633
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Lien :
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http://jat.oxfordjournals.org/content/23/5/323.full.pdf
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