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Letters |15 January 1995

Chronic Severe Hemolytic Anemia from Phenazopyridine

Anand B. Karnad; Robert J. Thomas

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We stand corrected. Pyridium itself is not available over the counter. However, the pharmacist who notified us of our patient's drug habit confirmed that our patient did purchase more than 12 boxes per week of one of several preparations available over the counter (Azostandard, Polymedica Pharmaceutical Inc., Woburn, Massachusetts; Reazo, Reese Chemical, Cleveland, Ohio; and Baridium, Pfeiffer Co., Wilkes-Barre, Pennsylvania) that contain 95 to 100 mg of phenazopyridine hydrochloride per tablet [1, 2].
We had overlooked the classic paper by Gabor and colleagues[3] that was perhaps the first to thoroughly document hemolysis caused by phenazopyridine. Other...
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Karnad AB, Thomas RJ. Chronic Severe Hemolytic Anemia from Phenazopyridine. Ann Intern Med. 1995;122:156–157. doi: https://doi.org/10.7326/0003-4819-122-2-199501150-00025

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Published: Ann Intern Med. 1995;122(2):156-157.

DOI: 10.7326/0003-4819-122-2-199501150-00025

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Print ISSN: 0003-4819 | Online ISSN: 1539-3704

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