A study was carried out to evaluate the acute effect of an intravenous injection of metformin on the fasting plasma concentrations of glucose, insulin, C-peptide, glucagon and growth hormone in 15 non-diabetic subjects. Metformin (1 g) was administered as a bolus in a peripheral vein and blood was sampled 2, 5, 10, 15 and 30 minutes after the drug injection. No significant change in fasting concentration of glucose nor in C-peptide, insulin, glucagon and growth hormone fasting levels was noticed. It is concluded that metformin does not possess an acute direct hypoglycaemic effect in non-diabetic subjects and does not acutely affect the basal activity of endocrine pancreas and pituitary gland in releasing insulin, glucagon and growth hormone.
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