We report the first case of hypoglycemia and lactic acidosis caused by the therapeutic doses of venlafaxine. A 19-year-old female patient had presyncope and she was taking venlafaxine 75 mg once a day because of major depression for a week and she had no history of any other drug use or disease. The blood gas analysis revealed hypoglycemia and lactic acidosis. Patient was treated with dextrose infusion and oral diet. Although hypoglycemia and lactic acidosis have been reported in overdose of venlafaxine in the literature, these effects were observed in therapeutic doses.

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