George R. Spratto

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The importance of age as an experimental variable in the evaluation of the analgesic, thermic, and respiratory depressant effects to morphine was studied in male rats one and one-half, six, and ten months of age. Significant age-related responses were observed in both the analgesic and thermic responses to morphine. Also, following a dose of 30 mg/kg(More)
A series of agents were tested for their ability to interact with the analgetic actions of either d-amphetamine (d-AMP) or l-amphetamine (l-AMP), or morphine in rats using the hot plate procedure. The analgetic action of l-AMP was potentiated by morphine and slightly antagonized by naloxone; it was antagonized by clonidine, alpha-MT, yohimbine, fluoxetine(More)
Since cocaine or diazepam are used clinically and/or abused concomitantly with narcotics, this study was designed to determine if morphine-dependent, morphine-withdrawn, or acute morphine rats exhibit an altered core body temperature at 24 or 4 degrees C to either cocaine (10, 20, or 30 mg/kg i.p.) or diazepam (2 or 4 mg/kg i.p.). At 24 degrees C, each dose(More)
The effects of cocaine, procaine, and lidocaine on open field and spontaneous (actophotometer) locomotor activities were assessed and compared in rats (1) treated acutely with morphine (single injection), (2) made dependent on morphine (SC pellets), (3) implanted with morphine and withdrawn at the time of peak dependence, and (4) implanted SC with(More)
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