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  • Title: Movement disorders induced in monkeys by chronic haloperidol treatment.
    Author: Weiss B, Santelli S, Lusink G.
    Journal: Psychopharmacology (Berl); 1977 Aug 16; 53(3):289-93. PubMed ID: 408858.
    Abstract:
    After several months of treatment, Cebus apella, Cebus albifrons, and Saimiri sciurea monkeys maintained on haloperidol, in doses of 0.5 or 1.0 mg/kg orally 5 days per week, began to display severe movement disorders, typically 1-6 h post-drug. Cebus monkeys exhibited violent, uncontrolled movements that flung the animals about the cage. Such episodes usually lasted only a few minutes, recurring several times during the period following drug ingestion. Writhing and bizarre postures dominated the response in S. sciurea. Cessation of drug treatment produced no distinctive after-effects. When tested as long as 508 days after the last administration, however, Cebus monkeys responded to haloperidol with several episodes of hyperkinesis, even at challenge doses considerably lower than those in the original treatment.
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