Distribution of 6 cephalosporin antibiotics, i. e. cephaloridin, cephalotin, cephradin cephacetryl, cephazolin and cephapyrin for parenteral use was studied comparatively on rats. The studies showed that all the above cephalosporins were well absorbed into the blood after intramuscular administration. The highest serum levels were achieved with the use of cephozolin. Still, its levels in the animal organs were mainly not higher and sometimes even lower than those provided by the other antibiotics. The highest levels of cephalosporins were detected in the kidneys. Cephalotin, cephapyrin and cephacetryl differed by the character of their distribution in the rats from the other 3 antibiotics: the levels of cephalotin and cephapyrin in the heart, spleen and muscles were lower than those of the other cephalosporins; sometimes they were even not detected in these organs; cephacetryl was not found in these organs. The levels of these 3 antibiotics in the kidneys were lower than those of the other cephalosporins. Cephalotin, cephacetryl and sometimes cephapyrin were not detected in the rat liver. None of the cephalosporins was found in the brain tissue.
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