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A 37-year-old woman with pheochromocytoma underwent presurgical FDG PET/CT. Despite her usual antiadrenergic medication consisting in 25 mg of carvedilol, PET/CT demonstrated intense and widespread FDG uptake in brown adipose tissue (BAT). No BAT FDG uptake was detectable on a repeated examination after specific preparation consisting in 40 mg propranolol and 5 mg diazepam. We therefore recommend this propranolol-diazepam preparation in patients with pheochromocytoma referred for PET/CT. Carvedilol—classically prescribed to alleviate effects of adrenergic overstimulation—seems ineffective on BAT. This observation questions the benefit of carvedilol to reduce β3-adrenoreceptor–mediated effects, not only in BAT, but also in other tissues.