Nateglinide Disease Interactions

The use of meglitinides is contraindicated in patients with type I diabetes or for the treatment of diabetic ketoacidosis, with or without coma.

The use of oral hypoglycemic agents may be associated with an increased risk of cardiovascular mortality compared to treatment with diet alone or diet with insulin. This warning is based on the University Group Diabetes Program (UGDP) study, a long-term prospective clinical trial designed to evaluate the effectiveness of glucose-lowering drugs in preventing or delaying vascular complications in patients with non-insulin-dependent diabetes. Patients treated with diet plus a fixed dosage of either tolbutamide (a sulfonylurea) or phenformin (a biguanide) for 5 to 8 years had a cardiovascular mortality rate approximately 2.5 times that of patients treated with diet alone, resulting in discontinuation of both these treatments in the study. Despite controversy regarding interpretation of these results, clinicians and patients should be aware of the potential risk when making treatment decisions for diabetes, particularly in the presence of underlying cardiovascular disease. Data are not available for other sulfonylureas or biguanides, nor for hypoglycemic agents belonging to other classes. However, given the similarities in chemical structure and/or mode of action, the same caution should be applied.

Hypoglycemia may commonly occur during treatment with insulin and/or oral hypoglycemic agents. Care should be taken in patients who may be particularly susceptible to the development of hypoglycemic episodes during the use of these drugs, including those who are debilitated or malnourished, those with defective counterregulatory mechanisms (e.g., autonomic neuropathy and adrenal or pituitary insufficiency), and those receiving beta-adrenergic blocking agents.

Nateglinide is primarily metabolized in the liver to both pharmacologically active and inactive substances. Patients with impaired liver function may be exposed to higher concentrations of nateglinide and its associated metabolites. Higher serum drug levels, in addition to diminished gluconeogenic capacity secondary to hepatic insufficiency, may increase the potential for severe hypoglycemic episodes. Therapy with nateglinide should be administered cautiously in patients with liver disease. Dosage adjustments may be necessary in moderate to severe hepatic impairment, although clinical data are lacking.