Summary
Mice, administered haloperidol 3 mg/kg/day, in their drinking water for 21 days, were tested for their responsiveness to cholinergic and anticholinergic drugs 4 days after withdrawal from haloperidol (or vehicle). Haloperidol-treated animals administered methylhyoscine (1 mg/kg i.p.) and various doses of physostigmine (5 to 1215μg/kg) displayed significantly less depression of locomotor activity than vehicle-treated animals. Atropine, 5 mg/kg, whilst ineffective in producing locomotor stimulation in vehicle-treated animals, produced marked stimulation in haloperidol-treated animals. Methylatropine (5 mg/kg) did not produce significant stimulation in either group. Dopamine receptor supersensitivity was present in these animals as haloperidol-treated mice, pretreated withα-methyl-tyrosine and reserpine, displayed a significantly greater locomotor response to apomorphine than did vehicle-treated animals. The data support the hypothesis that long-term administration of haloperidol produces an apparent hyposensitivity of central muscarinic receptors.
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Dunstan, R., Jackson, D.M. The demonstration of a change in responsiveness of mice to physostigmine and atropine after withdrawal from long-term haloperidol pretreatment. J. Neural Transmission 40, 181–189 (1977). https://doi.org/10.1007/BF01300132
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DOI: https://doi.org/10.1007/BF01300132