Single-dose tolerance to morphine-induced analgesic and hypoactive effects in infant rats.

TitleSingle-dose tolerance to morphine-induced analgesic and hypoactive effects in infant rats.
Publication TypeJournal Article
Year of Publication1981
JournalDevelopmental psychobiology
Volume14
Issue5
Pagination415-23
ISSN0012-1630
Abstract

A single injection of morphine or isotonic saline was administered to rats at either 1, 5, 9, ro 13 days of age. At 26-29 days of age, animals were tested for pain responsivity and activity following either morphine (5 mg/kg) or saline. Animals which received morphine at 1 day of age displayed tolerance at 26 days of age, whereas animals which received morphine at either 5, 9, or 13 days of age failed to display tolerance. This age-dependent change in susceptibility to single-dose morphine tolerance may involve alterations in opiate receptor ontogeny.

URLhttp://dx.doi.org/10.1002/dev.420140504
DOI10.1002/dev.420140504
Short TitleDev Psychobiol
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