135. ANTAGONISTS AND POTENTIATORS OF DRUGS ACTING ON THE BRONCHI (Continued) 



Part III; ANTIHISTAMINES 



Drugs are listed to illustrate, as far as possible, the relationship between chemical structure and pharmacological 

 action. C = constricts, D = dilates, A = antagonizes active drug effect, I = inactive (i.e., without influence on effect 

 of active drug), P = potentiates active drug effect. Parentheses in Columns F and H indicate action is slight, 

 irregular, or doubtful, and the original literature should be consulted. 



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