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To the Editor. —
In his article "When the Urine Is Red," Berman fails to mention what, in my experience, is one of the most common causes of red-colored urine—the ingestion of any one of a number of laxatives containing danthron. Although this phenomenon is mentioned in the Physicians' Desk Reference, apparently not many physicians know of it, for I have seen a number of patients referred for evaluation of hematuria in whom only this danthron-induced discoloration of urine was present.
Glucksman MA. More Causes of Red Urine. JAMA. 1977;238(14):1501. doi:10.1001/jama.1977.03280150071024
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