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Carroll ME, France CP, Meisch RA. 
“Food deprivation increases oral and intravenous drug intake in rats”. 
Science. 1979 Jul 01;205(4403):319-21.
Rats given continuous access to etonitazene hydrochloride in their drinking water (5 micrograms per milliliter) more than doubled their drug intake while deprived of food. Another group of rats with implanted jugular catheters self-administered etonitazene (10 micrograms per kilogram) intravenously on a continuous reinforcement schedule, and the number of infusions increased significantly on days when they were deprived of food. These results suggest that feeding condition may be a powerful determinant of drug-reinforced behavior.
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