Abstract

Summary (a) A comparison has been made of the efficiency of various oily injections of penicillin using a mouse-protection test. (b) It is concluded that the most satisfactory preparation consists of procaine penicillin of small particle size dispersed in a stearate/arachis oil gel. (c) A theory is suggested for the mechanism by which aluminium stearate induces “slow-release.“ I am indebted to Dr. O. L. Davies for the design of the tests and the analysis of results, to Dr. A. R. Martin for supervision of the biological work, and to Mr. A. G. Fishburn for help in the preparation of the paper.

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