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

 Part III: ANTIHISTAMINES (Continued) 

 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. 



Ethylenediamines (continued) 



235 



