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1 Department of Pharmacology, The George Washington University School of Medicine, Washington, D. C.
Para-aminobenzoic acid is rapidly absorbed and excreted. In the rat the concentrations in the plasma are appreciably higher than in brain, muscle and erythrocytes.
In normal man very little of the drug is excreted as free PABA and only a small amount is excreted as acetylated PABA. Most of it is excreted either as a conjugation product with glycine (p-aminohippuric acid) or as the glucuronate. A small amount of the glucuronate derivative is also acetylated.
Submitted on February 23, 1951