Abstract
Probenecid was administered orally in a dose of 1 g twice daily for 3 days to eight patients nutriated through a gastric tube with a standarized diet containing a known amount of tryptophan. Probenecid caused an increase by 52% (P<0.01) in the free (non protein-bound) concentration of tryptophan in plasma (from 1.22±0.16 to 1.86±0,28 Μg/ml; mean±SEM). The total (free + protein-bound) plasma tryptophan concentration was not significantly changed by the present dose of probenecid. There was a positive correlation (Spearmans rank correlation coefficient =0.74; P<0.05) between the increase in percentage free tryptophan and the achieved plasma concentration of probenecid. The cerebrospinal fluid (CSF) concentration of tryptophan was not significantly changed by probenecid (2 g/day during 21/2 days) given to another group of five patients.
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