136. pAx VALUES FOR ANTAGONISTS OF DRUGS ACTING ON THE BRONCHI 



Values are the negative logarithm of the molar concentration of antagonist required to reduce the response to an 

 "x-fold" dose of active drug to that produced by a single dose of active drug in the absence of antagonist [ l] . Paren- 

 theses indicate action is irregular and the original literature should be consulted. C = constricts, D = dilates. 



Contributor : Hawkins, D. F. 



References : [l] Schild, H. O., Brit. J. Pharm. 2:189, 1947. [2] Parkes, M. W., personal communication, 1949. 



[3] Arunlakshana, O. (thesis), London, 1953. [4) Hawkins, D. F., and Paton, W. D., unpublished, 1957. 



[5] Hawkins, D. F. (thesis), London, 1952. [6] Hawkins, D. F. and Schild, H. O., Brit. J. Pharm. 6:682, 1951. 



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