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To the Editor.—
We have carefully noted Dr. Gordon's comments and we appreciate his interest in this subject.Our patient 1 received vitamin A for over 16 weeks, initially 300,000μ/day and for the last nine weeks, 525,000μ/day; part of this dosage was administered intramuscularly. The patient's condition became worse during this time. We know of no report of a series of patients with PRP that has favorably responded consistently and decisively to vitamin A therapy. We agree that more needs to be learned about the use of vitamin A. We also agree that caution should be used when administering methotrexate, as we emphasized in our communication.We do not agree with the implication of the statement "... PRP is not usually the kind of disease that should be treated with a dangerous drug." Vitamin A in large doses is not innocuous. When PRP is so extensive and disabling that the patient
Knowles WR, Chernosky ME. PITYRIASIS RUBRA PILARIS-Reply. Arch Dermatol. 1971;103(5):563–564. doi:10.1001/archderm.1971.04000170097025
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