Abstract
To examine whether or not prolonged exposure to a depot neuroleptic has either residual or “tardive pathological” effects onnormal behavior, 38Cebus apella monkeys were observed daily for 108 weeks. The issue of stress influencing such effects was also addressed. During weeks 25–48 half of the monkeys received 0.22 mg/kg fluphenazine decanoate, IM, every 3 weeks, with the dose increased to 0.33 mg/kg during weeks 49–72. Behavioral measures were combined to form composite behavioral variables which quantify four major aspects of behavior: self- and environment-directed behavior, affiliation, aggression, and normal locomotor activity. Mean plasma fluphenazine levels at 48 h post-injection were 0.13 (±0.03) ng/ml for injections 3–8 and 0.24 (±0.07) ng/ml for injections 11–16. The pre-study null hypothesis that the four major aspects of behavior would not be adversely affected by this treatment during the drug-discontinuation phase of the study (weeks 73–108) wasnot statistically negated. There were highly significant decreases in self-and environment-directed behaviors and affiliation during the treatment periods, implying that treatment may contribute to the negative symptoms of treated schizophrenics. Stress reduced the above effects. Aggression showed some increase during early drug discontinuation, accentuated by stress. Recovery of normal (baseline) behavioral scores began by week 7 after the last treatment. Mild (bucco-lingual) tardive dyskinesias persisted in 30% of the animals for a prolonged time.
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Lifshitz, K., O'Keeffe, R.T., Lee, K.L. et al. Effect of extended depot fluphenazine treatment and withdrawal on social and other behaviors ofCebus apella monkeys. Psychopharmacology 105, 492–500 (1991). https://doi.org/10.1007/BF02244369
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DOI: https://doi.org/10.1007/BF02244369