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Eur J Pharmacol. 2003 Jan 17;459(2-3):217-9.

Naloxone displacement at opioid receptor sites measured in vivo in the human brain.

Author information

1
Psychopharmacology Unit, School of Medical Sciences, University of Bristol, University Walk, BS8 1TD, Bristol, UK.

Abstract

We report the use of a sensitive non-tomographic positron detecting system to measure the dose-response curve of naloxone in human brain. [11C]Diprenorphine was administered to normal volunteers in tracer amounts and, 30 min later, various bolus doses of naloxone were given (1.5-160 microg/kg) intravenously and change in [11C]diprenorphine binding monitored over the next 30 min. We found that this method produced results consistent with existing data. It was observed that approximately 13 microg/kg of naloxone ( approximately 1 mg in an 80 kg man) was required to produce an estimated 50% receptor occupation. This is consistent with the clinical dose of naloxone used to reverse opiate overdose (0.4 mg-1.2 mg).

PMID:
12524149
DOI:
10.1016/s0014-2999(02)02872-8
[Indexed for MEDLINE]

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