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Awakening properties of modafinil: effect on nocturnal activity in monkeys(Macaca mulatta) after acute and repeated administration

Single oral administration of modafinil (16–64 mg/kg) in monkeys induced an increase in nocturnal activity and in behavioural arousal without stereotyped behaviour. Modafinil-induced increase in nocturnal activity was prevented by the centrally acting α₁ adrenoceptor antagonist prazosin. After repeated oral administration of modafinil, b.i.d. for 5 days, nocturnal activity was still increased, but was lower than after a single administration; the gradual decrease appeared on the second night. No rebound of sleep and no residual effect on night 5 (when modafinil was administered for 4 days and placebo on day 5) were seen after the withdrawal of the drug. Therefore, modafinil appeared to produce strong behavioural stimulation and awakening in a non-human primate species, after single, as well as after repeated administration, without other obvious side-effects (no sign of anxiety, no behavioural trouble). These awakening properties involved a modulation (stimulation) of a central α₁ adrenergic system.

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1. Centre de Recherches du Laboratoire L. Lafon, 19, avenue du Professeur Cadiot, B.P. 22, F-94701, Maisons-Alfort Cedex, France

   Jean-François Hermant, Francis A. Rambert & Jacques Duteil

1. Jean-François Hermant
2. Francis A. Rambert
3. Jacques Duteil

Hermant, JF., Rambert, F.A. & Duteil, J. Awakening properties of modafinil: effect on nocturnal activity in monkeys(Macaca mulatta) after acute and repeated administration. Psychopharmacology 103, 28–32 (1991). https://doi.org/10.1007/BF02244069

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• Received: 28 March 1990

• Revised: 12 June 1990

• Issue Date: January 1991

• DOI: https://doi.org/10.1007/BF02244069

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