Correlation of plateau serum salicylate level with rate of salicylate metabolism

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Abstract
The range of plateau serum salicylate concentrations was 4.4 to 33 mg/100 ml in patients with rheumatoid arthritis after they were treated with 50 mg/kg of aspirin daily for 5 days. Individual plateau serum levels correlated better with urinary excretion rates of the metabolite, salicylurate (whose maximum production is capacity‐limited), than with total urinary excretion of salicylates. These observations suggest that large intersubject variations in plateau serum salicylate levels are determined, at least in part, by similar differences in the maximum rates of capacity‐limited metabolic reactions. For optimal therapeutic responses, individualization of aspirin dosage by following serum salicylate levels is recommended.

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