An 85-year-old man presented to the emergency department with delirium. He was taking the anticonvulsant primidone to manage essential tremors. His estimated glomerular filtration rate was low at 52 mL/min/1.72… Click to show full abstract
An 85-year-old man presented to the emergency department with delirium. He was taking the anticonvulsant primidone to manage essential tremors. His estimated glomerular filtration rate was low at 52 mL/min/1.72 m2. A urine barbiturate drug screen was positive (cutoff concentration 300 μg/L). Gross examination of the urine revealed an unusual hazy glistening appearance with white masses …
               
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