110 VETERINARY MATERIA MEDICA. 



for the drug market. Its active principle is an alka- 

 loid called hyoscyamine, which is probably identical 

 with atropine. From it is derived hyoscine, a semi- 

 liquid alkaloid yielding tropic acid and pseudotro- 

 pine. 



Preparations. — Extractum Hyoscyami, solid 

 extract of henbane. Dose: H., 3ss.-i.; D., gr. ss.-ij. 



Extractum Hyoscyami Fluidum, fluid extract of 

 henbane. Dose: H., fl. 3 iss.-vi. ; D., tt[ y.-xx. 



Tincturn Hyoscyami, tincture of henbane. Dose : 

 H., fl. 3 i.-iij. ; D., fl. 3 ss.-iij. 



HyoscyamincE Sulphas, hyoscyamine sulphate. 

 Dose: H., gr. ss.-v. ; D., gr. ^Vi- Hypodermically, 

 one-half of these doses. 



Hyoscince Hydrohromas. Dose: H., gr. ^-i; 



D., gr. 10 TIT- 



Incompatihles are liquor potassse and all other 



fixed caustic alkalies. 



Actions and Uses fo Hyoscyamus.— It is simi- 

 lar in action to belladonna, but not so powerful. Is 

 a good calmative and hypnotic, anodyne and antispas- 

 modic, and is sometimes used like atropine as a my- 

 driatic. Full doses stimulate the brain centres and 

 paralyze motor nerve endings ; over-doses destroy life 

 by paralyzing the respiratory function. Hyoscya- 

 mus does not check peristalsis, and therefore is useful 

 as a hypnotic and anodyne in irritable conditions of 

 the alimentary canal and urinary apparatus when 

 opium is contraindicated. It is frequently combined 

 with cathartics to enhance their activity and at the 

 same time to prevent griping. It is prescribed as an 



