CEREBRAL DEPRESSANTS. 135 



2. Codeina, codeine — calmative and less constipat- 

 ing. 



3. Thebaina, thebaine — a tetanizer and not used 

 medicinally. 



4. Narceina, narceine — regarded as the most hyp- 

 notic of the six. 



5. Papaverina, papaverine — of doubtful action; 

 supposedly narcotic and convulsant. 



6. Narcotina, narcotine — wrongly named, as it is 

 a tetanizer and highly antiperiodic. 



These principles are combined in the plant with 

 meconic and lactic acids. 



A derivative of morphine, obtained by the action 

 of HCl, is— 



Apomorphina, apomorphine — an artificial alkaloid 

 and a powerful emetic. Its hydrochlorate, which is 

 ofiScial, is given to the dog in doses of gr. ^ per os, 

 or gr. aV iV subcutaneously. 



Chief Prepaeations of Opium used in veterin- 

 ary practice are : 



Opii Pulvis, powdered opium. Dose : H. , 3 i.-ij. ; 

 D., gr. i-iij. 



Extractum Opii, extract of opium (aqueous). 

 Dose: H., 3 ss.-i. ; D., gr. ^iss. 



Tinctura Opii, U. 8. P. (ten per cent.), tincture 

 of opium, laudanum. Dose: H., fl. | i.-ij.; D., 

 Til viij.-xx. 



Tinctura Opii Camphorata, Elixir Paregoric, 

 camphorated tincture of opium, paregoric, elixir pare- 

 goric. Contains powdered opium 4, benzoic acid 4, 

 camphor 4, oil of anise 4, glycerin 40, and diluted al- 



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