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Abstract
After chronic administration of Phencyclidine (PCP) to rats, a high test dose (15 mg/kg) of PCP produced increases in stereotypic and ataxic behaviors, and a lower test dose of PCP (5 mg/kg) produced decreases in these behaviors, compared to behavioral responses of control rats. Rearing behavior in rats chronically administered PCP was increased at all test doses of the drug. Rats treated chronically with 15 mg/kg PCP for 9 days showed marked increases in most of these behaviors, whereas, rats receiving 5 mg/kg PCP for 9 days showed less change in several stereotypic and ataxic behaviors. Rats receiving 10 mg/kg PCP on a once-weekly schedule also exhibited more rearing and ataxic behavioral responses after the 3rd or 4th weekly PCP injection. Chronic PCP rats did not show more stereotypic or ataxic behavior after administration of apomorphine or amphetamine than control rats. These results suggest that chronic administration of PCP augments sensitivity to the stereotypic inducing effects of high doses, and decreases sensitivity to low doses of PCP.
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