PMID: 6767639Jan 1, 1980Paper

Serum glibenclamide in diabetic patients, and influence of food on the kinetics and effects of glibenclamide

G SartorE Wåhlin-Boll


The steady state concentrations of glibenclamide in serum were measured radioimmunologically in 37 diabetic patients after administration for at least a year. No other antidiabetic drugs had been given. The interindividual variation in glibenclamide concentrations was extremely large (0 to 1520 nmol/l), greatly exceeding the variation in dosage (2.5--25 mg daily). There was no relation between dose and serum concentration of glibenclamide. Only four (9%) patients had fasting blood glucose concentrations below 5.5 mmol/l, and fewer than half had values below 8 mmol/l. In most cases, therefore, the therapy was inadequate. Single-dose kinetics of glibenclamide was assessed in healthy volunteers. Food intake did not influence the bioavailability of a 5 mg dose of glibenclamide. There was no insulin increase in response to glibenclamide unless a meal was also given, and this increase was not significant until 1 h after administration of drug and meal, when the mean serum concentration of glibenclamide had reached 100 nmol/l. Even in the fasting state, however, there was a progressive fall in blood glucose after glibenclamide administration, significant within 45 min and with a nadir at 2--2 1/2 h.


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