PMID: 620227Jan 21, 1978Paper

Serum tolbutamide and chlorpropamide concentrations in patients with diabetes mellitus

British Medical Journal
A MelanderP O Bitzén


A selective and sensitive gas chromatographic technique was used to measure the steady-state serum concentrations of tolbutamide and chlorpropamide in 97 patients with maturity-onset diabetes mellitus who had been taking these drugs (37 tolbutamide, 60 chlorpropamide) for at least a year. No other antidiabetic agents had been given. The serum tolbutamide concentrations varied widely between the patients (from close to zero to 370 mumol/l (100 mug/ml)), yet the variation in dosage was only sixfold (0.5-3.9 g daily). The serum chlorpropamide concentrations varied even more widely (from close to zero to 882 mumol/l (244 mug/ml)), though the dosage variation was fourfold (125-500 mg daily). There was no systematic relation between dosage and serum concentrations of the drugs.Only 2 (5.4%) of the tolbutamide-treated patients and 10 (16.7%) of the chlorpropamide-treated patients had normal fasting blood glucose concentrations (below 5.5 mmol/l (99 mg/100 ml)), and fewer than half had values below 8.0 mmol/l (144 mg/100 ml). In most cases, therefore, the treatment was insufficient.There was no significant difference in mean fasting blood glucose concentrations between the two treatment groups. The mean steady-state concentration of ch...Continue Reading


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Related Concepts

Blood Glucose
Chromatography, Gas-Liquid
Diabetes Mellitus
Tolbutamid R.A.N.

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