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Chronic haloperidol treatment during prenatal and postnatal development was found to induce long-term behavioral and psychopharmacological effects. Rats tested shortly after termination of the chronic treatment at weaning or as young adults were hyperactive in the open field and exhibited an attenuated behavioral response to amphetamine and an accentuated cataleptic response to later doses of haloperidol, when compared with control offspring of the same age. Tests at an intermediate interval (adolescence period) showed no significant difference from control offspring on any of these behavioral measures. Adult rats administered haloperidol chronically for the same duration were also hyperactive after termination of treatment. In contrast to the effects of haloperidol during development, these adults exhibited an accentuated behavioral response to amphetamine and an attenuated cataleptic response to a later dose of haloperidol. Compensatory mechanisms in response to chronic haloperidol treatment during development thus appear to be different from those in adulthood.
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