Abstract
The penetration of penicillin into tissue cage fluid (TCF) in calves was studied after intravenous and intramuscular injection. The penicillin concentrations in TCF were lower than in serum and maximum was reached much later. Intravenous injection of benzyl-penicillin gave significantly higher levels in TCF than intramuscular injection. The penetration after procaine penicillin was very slow. The results showed that the serum peak rather than the area under curve determines the penetration of penicillin. Repeated intramuscular injections of benzylpenicillin and procaine penicillin caused an accumulation of penicillin in TCF. Similar levels were however reached by one single intravenous injection. The clinical counterparts to the used tissue cage model are abscesses. It was concluded that if high penicillin concentration are desireable in such foci, the drug must be given in a way that gives as high serum peaks as possible.
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