Glucose intolerance in cats given short-term therapies of prednisolone and megestrol acetate.

Six cats were each given prednisolone (2 mg/kg of body weight/day) and megestrol acetate (5 mg/cat/day) on separate occasions for 8 days. The drugs induced similar increases in fasting blood glucose concentrations and decreases in glucose excretion rates in the cats. Usually, each cat developed reduced tolerance of an IV glucose load; concomitant fasting hyperglycemia occurred in 3 cats after prednisolone therapy, and in 1 of these 3 cats after megestrol acetate.