Distribution in normal and inflammatory tissue of a new semisynthetic cephalosporin, SK&F 75073.

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Abstract
SK&F 75073 is a new cephalosporin with broad spectrum antibacterial activity. SK&F 75073-14C and cefazolin-35S were administered separately to groups of rats as a single intramuscular dose of 20 mg/kg. Tissues with highest drug levels 15 minutes following dose were as follows: (SK&F 75073/cefazolin levels), kidney - 86/70 μμg/g, liver - 33/22 μg/g, lung - 29/17μg/g, heart - 23/10 μg/g, adrenal - 13/7 μg/g. Plasma levels at peak were 134 μg SK&F 75073/ml (half-life, 1.9 hours) and 72 μg cefazolin/ml (half-life, 0.75 hours). Dose excreted in 24 hours was: SK&F 75073, urine 66% and feces 27% ; cefazolin, urine 96% and feces 2%. Both antibiotics were also administered, at 20 mg/kg, to rats with the carrageenan-induced inflammatory pouches. Exudate from these pouches contained from 2 to 10 times more SK&F 75073 than cefazolin. Radioassay and bioassay of these substances in the exudate gave similar results. Serum protein binding ranged from 96-98% for SK&F 75073 and 34-69% for cefazolin. Data indicated that highly protein bound SK&F 75073 enters tissues and tissue fluid to a greater extent than the lesser bound but therapeutically proven antibiotic agent cefazolin.

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