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.
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Middleton et al. (1985) studied this question.