208 TETEEINART MATERIA MEDICA. 



Oxidizers. — Nitric acid, free, hydrochloric acid, 

 chromic acid, nitrohydrochloric acid, potassium 

 chlorate, potassium permanganate. 



•OxiDiZABLB OR COMBUSTIBLE. — Glycerin, sugar, 

 alcohols, oils and ethers, sulphur and sulphides, dry 

 organic substances, phosphorus. 



Pharmaceutical incompatibility differs from 

 chemical incompatibility in the absence of chemi- 

 cal action, and is generally caused by adding one 

 substance to another, which, through differences in 

 solubility, cause a precipitation of solid matter or a 

 separation of part of the liquid . Examples of phar- 

 maceutical incompatibility are: 



Eesinous tinctures or fluid extracts with aqueous 

 solutions. Essential oil with aqueous liquids in 

 quantities exceeding 1 drop to f i. Tinctures made 

 with alcohol with those made with diluted alcohol. 

 Alcoholic tinctures and fluid extracts with aqueous 

 preparations. Infusions generally, with metallic 

 salts. 



Therapeutical incompatibility arises when two 

 agents are administered together which oppose each 

 other in action on the system — as physostigmine with 

 belladonna; morphine with atropine. The latter, 

 however, are frequently used together, the one to act 

 as a guard against excessive action of the other. See 

 also under Antagonists of the various drugs, under 

 their respective titles. 



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