Abstract
Oral administration of 250 mg hydrochlorothiazide/kg, with previous i.v. injection of 4 i.u. soluble insulin or s.c. injection of protamine-zinc insulin, has been found to produce stable hyperglycaemia in rabbits irrespective of sex. It is thought that insulin helps the selective action of hydrochlorothiazide on the beta cells by removing the protective glucose barrier. Although stimulation of glucagon or some extra-pancreatic mechanism at the initial stage could not be altogether ruled out, the central action of the drug is supported by the finding that the hydrochlorothiazide-induced hyperglycaemia was lowered by the sulphonylurea derivative, chlorpropamide.
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