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The fate of sulphadimethoxine in primates compared with other species.

ABSTRACT: 1. The metabolism of sulphadimethoxine (2,4-dimethoxy-6-sulphanilamidopyrimidine) was examined in nine species of primates and nine species of non-primates. 2. The main metabolite of the drug in the urine in man, rhesus monkey, baboon, squirrel monkey, capuchin, bushbaby, slow loris and tree shrew was sulphadimethoxine N(1)-glucuronide. In the green monkey, although the main metabolite was N(4)-acetylsulphadimethoxine, the N(1)-glucuronide was also a major metabolite. 3. In the dog, rat, mouse, guinea pig, Indian fruit bat and hen the N(1)-glucuronide was a minor metabolite in the urine, whereas in the cat, ferret and rabbit this glucuronide was not found in the urine. 4. All the species examined except the dog excreted some N(4)-acetylsulphadimethoxine, which was the major metabolite in the green monkey, rabbit and guinea pig. 5. In the tree shrew, a doubtful primate, N(1)-glucuronide formation was similar to that in the other primates. 6. It is suggested that the slow excretion of the drug by the rat may be due partly to strong binding of the drug to tissue proteins and that the strength of binding may vary with species. 7. In the rat the amount of N(1)-glucuronide found in the urine is not a true indication of the extent of this conjugation since much more of the conjugate was found in the bile (7% of the dose) than in the urine (1%). In the rabbit, no N(1)-glucuronide was found in the bile or urine, but a small amount of sulphadimethoxine N(4)-glucuronide was found in the bile of the rat (0.5% of dose) and rabbit (0.8%).

SUBMITTER: Adamson RH

PROVIDER: S-EPMC1179076 | biostudies-other | 1970 Jun

REPOSITORIES: biostudies-other

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