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To the Editor.—
At least in the Bronx, at our large urban public hospital, neither phenazopyridine hydrochloride (which we cannot afford because of the New York City budget crisis) nor phenolsulfonphthalein, which we do not use as a test of kidney function, are a cause of "red urine." Rather, the commonest cause of red ("orange, pink, red, brown, and black") urine is laxatives containing phenolphthalein, followed closely by others containing cascara.
Bell BM. More Causes of Red Urine. JAMA. 1977;238(14):1501. doi:10.1001/jama.1977.03280150071025