Drug therapy in patients with diabetes mellitus: an audit

The drug therapy prescribed for 412 diabetic patients attending an outpatient clinic over a 12 week period was recorded to try and identify potential therapeutic problems. Over 90% of the patients were prescribed at least one drug (including insulin) with oral hypoglycaemic agents prescribed for 86% of non-insulin requiring diabetics. 19% of patients were prescribed more than three drugs and few patients took drug combinations. Of patients prescribed either glibenclamide or chlorpropamide, 63% were aged 65 yr or older. Despite their potential adverse clinical and biochemical effects, diuretics and beta-blockers were commonly prescribed, especially in hypertension. The prescribing of "newer" anti-hypertensive drugs, combination products in patients taking a multiple drug regimen, and the potential dangers of sulphonylureas in the elderly are three areas where alteration of prescribing habits may be of value.