Sibutramine-induced pheochromocytoma crisis: A rare and lethal occurrence

Pheochromocytoma is a neuroendocrine tumor that secretes catecholamines; excessive catecholamine secretion can lead to pheochromocytoma crisis (PCC), a rare and life-threatening condition. Sibutramine, a serotonin and norepinephrine reuptake inhibitor, was previously used for obesity treatment but is now banned due to its cardiovascular side effects. Although fatalities related to PCC and adverse events associated with sibutramine have been frequently reported individually, there is no documented literature addressing PCC-induced by sibutramine. Here we report a rare case of fatal sibutramine-induced PCC in a previously asymptomatic young female with undiagnosed pheochromocytoma. The 25-year-old patient took a weight-loss pill containing sibutramine for the first time and subsequently experienced nausea, vomiting, chest tightness, and other symptoms. She went to hospital about 6 hours after taking the pill but died approximately 4 hours later despite the resuscitation efforts. An autopsy revealed a pheochromocytoma in the right adrenal gland. The cause of death was attributed to sibutramine-induced PCC. To our knowledge, this is the first report to document the occurrence of sibutramine-induced PCC.