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Cinoxacin is a new synthetic organic antibacterial compound which has a serum half-life of approximately 1 hour. Most of the drug is eliminated in man by the kidney, primarily as unchanged drug. The renal clearance of cinoxacin is slightly greater than the usually accepted value for the average glomerular filtration rate, which suggests that it is probably filtered and is also secreted by the tubule. Results after pretreatment with probenecid further suggest secretion of the drug.

A gas-chromatographic method is described for determination of codeine and norcodeine in human plasma. The method is specific, sensitive, and precise. It was developed for use in bioavailability studies of therapeutic doses of codeine sulfate. After ingestion of a 60-mg codeine sulfate tablet, mean peak codeine concentration in plasma was 107 µg/liter at 1.0 hour. No measurable concentration of norcodeine was found in the plasma by this method.

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