Risperidone-associated new-onset diabetes

Background: Weight gain, and its associated complications such as the development of diabetes, is becoming increasingly recognized as an important potential side effect of the novel antipsychotic drugs. Methods: Two retrospective cases are described in which patients with schizophrenia developed diabetes while taking the antipsychotic medication risperidone. Results: Both patients had preexisting risk factors for diabetes and developed insulin resistance in the context of weight gain. Both cases necessitated medical intervention and one patient requires ongoing treatment with insulin. Conclusions: Although the exact mechanism of antipsychotic induced diabetes remains obscure, weight gain appears to be a significant risk factor. Careful monitoring of weight and fasting glucoses is recommended for any patient taking novel antipsychotic medications.