Abstract
These studies demonstrated that continuous morphine treatment from implantation of a 75 mg morphine pellet for 3 days potentiated pentobarbital narcosis and enhanced pentobarbital hypothermia. In the morphine implant mice, sleeping time after two different doses of pentobarbital was greater than 2.5 × the sleeping time in placebo pellet implant animals and also greater than sleeping time in animals treated acutely with morphine prior to pentobarbital. Moreover, in the morphine implant mice both the degree and duration of pentobarbital induced hypothermia were enhanced. The above findings were due to slower rate of metabolism of pentobarbital as evidenced by inhibition of hepatic N-demethylation, and higher levels of brain and serum pentobarbital in the morphine implant mice compared to both placebo and acute morphine mice.
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