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The penetration of cefoxitin into cerebrospinal fluid (CSF) was studied in 25 patients with purulent meningitis treated with antibiotics other than cefoxitin. Each patient received three 2-g doses of cefoxitin at 6-h intervals. Blood and CSF samples were obtained before and at 2, 4, or 6 h after the first and third doses. CSF cefoxitin concentrations were found in all patients and varied between 1.2 and 22.0 microgram/ml, with a majority of the concentrations falling within a range from 1.2 to 6.2 microgram/ml. The concentrations tended to be higher in CSF samples drawn after the third cefoxitin dose than in those drawn after the first cefoxitin dose, indicating an accumulation of cefoxitin in CSF with repeated doses. Peak cefoxitin concentrations in CSF seemed to occur between 2 and 6 h after intravenous administration of the drug since the highest concentrations were found in patients from whom CSF samples were taken 4 h after the doses. In patients with bacterial meningitis, it should be possible to achieve therapeutic cefoxitin levels in CSF by using nontoxic doses of the antibiotic.

Cefoxitin penetration into cerebrospinal fluid in patients with purulent meningitis