DRUGS ACTING ON THE EESPIRATOEY ORGANS 49 



action on the broncliial mucous membrane during their 

 elimination. 



Expectorants 



(1) INCREASINa SECRETION 



Depressing the henrf and lowering vascular tension 

 f" depressing expectorants" J 



Apomorphine Ipecac Antimony and potas- 



Potassium iodide Pilocarpine sium tartrate 



Stimulating the heart and increasing vascular tension 

 ("stimulating expectorants" J 



Ammonium chloride Sulphur Terpin hydrate 



Volatile oils, and drugs containing them, first increase and then decrease 

 bronchial secretion as a secondary effect. 



(3) ALTERING THE NUTRITION OP BRONCHIAL MUCOUS MEMBRANE 



Potassium iodide Cod-liver oil Sulphur 



Ammonium chloride 



(4) EXERTING AN ANTISEPTIC ACTION 



Turpentine Tar Balsam of Tolu 



Terebene Ammoniacum Cubebs 



Terpin hydrate Balsam of Peru Copaiba 



Uses. — Expectorants are chiefly prescribed in bronchitis. 

 In the early or dry stage drugs increasing secretion and at 

 the same time depressing ±he circulation are often employed 

 in sthenic cases. These drugs possess less value in the 

 treatment of the horse, on account of comparative insuscep- 

 tibility to them, than in the case of dogs. 



If exudation is excessive, then drugs lessening secretion 

 are indicated. "When the disorder is persistent, agents alter- 

 ing and improving the nutrition of the bronchial mucous 

 membrane are beneficial. Bronchitis accompanied by a 



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