Abstract
This investigation examined whether or not physical dependence or other abnormalities were detectable 1–3months after withdrawal in dependent rats that had been treated with the morphine (maintenance dose of 100×2mg/kg/day,s.c.) for 7 weeks. When narcotic antagonists were administered on the 32nd day after withdrawal, nalorphine caused a dose-dependent increase in spontaneous locomotor activity and a complete inhibition of wet-dog shakes and the writhing syndrome. Naloxone was ineffective. A remarkable increase in spontaneous locomotor activity on the 67th day and a significant increase in body weight on the 69th and 92nd day after withdrawal occurred after an acute injection of morphine (10 mg/kg, s.c.). When morphine (10 mg/kg) was administered for 3 days from the 92nd day after withdrawal, withdrawal from morphine produced a significant decrease in body weight. When morphine (10 mg/kg) was administered for 3 days from the 102nd day after withdrawal, a levallorphan injection caused a significant decrease in spontaneous locomotor activity and an increase in the frequency of the diarrheal syndrome. These abnormal responses, not observed in the naive rats, suggest the remains of some behavioral and biochemical abnormalities 3 months after morphine withdrawal.
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Nakamura, H., Ishii, K. & Shimizu, M. Some altered responses in rats formerly dependent on morphine. Psychopharmacology 56, 269–277 (1978). https://doi.org/10.1007/BF00432849
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DOI: https://doi.org/10.1007/BF00432849