Acute muscle necrosis after chronic overdosage of phenformin and fenfluramine.

A case of acute muscle necrosis with probable myoglobinuria is presented. The patient had been taking excessive doses of phenformin and fenfluramine, and a toxic etiology is suggested. Muscle necrosis is tentatively attributed either to the combined effect of these drugs on some underlying biochemical abnormality of muscle or to a defect of oxygen utilization secondary to myoglobin alterations.