Abstract
The effects of acute and chronic morphine treatment on glucose tolerance were investigated in mice. In acute experiments, a single dose of morphine (20 mg/kg i.p.) increased the serum and muscle glucose level. After glucose loading (1.5 g/kg), the rate of increase and the peak of serum glucose concentration were significantly lowered in morphine-treated mice, while the availability and the half-life of glucose were similar to those of controls. In morphine-dependent mice, the fasting serum and muscle glucose levels were similar to those of control but the liver glucose was significantly greater. After glucose loading the rate of increase in serum glucose level was faster and the availability of glucose was 10% greater than that in naive mice. Again, there was no difference in the half-life of serum glucose between naive and morphine-dependent mice.
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