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1 The University of Michigan, Department of Pharmacology, Ann Arbor, Michigan
Rectal temperature was recorded in monkeys restrained in primate chairs. Morphine dependence was produced by the s.c. administration of morphine (3.0 mg/kg) repeated every 6 hr. In nondependent monkeys, chair restraint produced a small fall in temperature (0.6 ± 0.1°C). In morphine-dependent monkeys placement in the restraining chair 3 to 7 hr after a regular injection of morphine precipitated falls in body temperature as large as 8°C. Body temperature returned to normal when morphine was administered. These hypothermic responses did not occur if the monkeys were placed in the restraining chair within the first 3 hr after morphine. Administration of 1.0 mg/kg of nalorphine to morphine-dependent monkeys, a dose which produced no change of body temperature in nondependent monkeys, precipitated a severe abstinence syndrome and a large hypothermia. This hypothermic effect of nalorphine could be demonstrated after only 1 week of morphine treatment. Nalorphine also produced hypothermia in ketobemidone-dependent monkeys.
Submitted on August 19, 1968
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