Severe metabolic acidosis secondary to coadministration of creatine and metformin, a case report.

It is known from studies in young athletes that creatine supplements have beneficial effects on muscular functional capacity, so it is being widely used as a performance-enhancing substance in both professional and amateur sports men and women. They are approved and considered relatively safe, but there have been a few case reports of renal dysfunction associated with their use. We present the case of a patient who developed acute renal failure and lactic acidosis while using creatine and metformin simultaneously.