Abstract
Metformin is a first-line oral anti-hyperglycemic agent. It decreases insulin resistance, decreases hepatic glucose output and enhances peripheral glucose uptake. Metformin is used as a monotherapy in combination with other oral hypoglycemic agents. A major side-effect of metformin is lactic acidosis. The elimination of metformin is mainly through the kidneys, and raised plasma concentrations can cause lactic acidosis. Provided there is no overdose, metformin-associated lactic acidosis rarely develops in patients without co-morbidities such as renal or hepatic insufficiency, acute infection or severe dehydration. Herein, we report a case of metformin-induced metabolic acidosis occurring in a woman who was severely dehydrated after performing Haj and treated conservatively.