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1 Department of Internal Medicine (Division of Clinical Pharmacology) and the Department of Pharmacology, University of Iowa College of Medicine, Iowa City, Iowa 52242.
The effect of hypothyroidism on dipyrone metabolism was studied in six patients, and the effect of hyperthyroidism in two patients. These patients were studied both before and after appropriate treatment.
In the hypothyroid subjects, plasma dipyrone levels were elevated and urinary excretion of 4-aminoantipyrine was decreased; treatment with liothyronine partially corrected this. In the hyperthyroid subjects, plasma dipyrone levels were normal and the urinary excretion of 4-aminoantipyrine was decreased; treatment increased the excretion of 4-aminoantipyrine toward normal.
These findings suggest that in man an absence of thyroid hormone decreases the N-demethylation of dipyrone and that excessive endogenous thyroid hormone may have a similar effect.
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