Extractum Hydrastis, B.P.C. Extract of Hydrastis.
Related entries: Hydrastis
Synonyms.—Hydrastin; Extractum Hydrastis Siccum; Dry Extract of Hydrastis.
|Hydrastis Rhizome, in No. 60 powder||100.00|||||20 ounces|
|Alcohol (60 per cent.), a sufficient quantity.||||
Exhaust the drug by percolation with the alcohol, recover most of the alcohol by distillation, evaporate the residue to dryness, and transfer it immediately to a well-stoppered bottle. This preparation should be prescribed as "Extractum Hydrastis," as the name "hydrastin" is liable to confusion with that of the alkaloid hydrastine. It has been suggested that this extract should be standardised to contain 20 per cent. of total alkaloids, of which should be hydrastine.
Dose.—3 to 12 centigrams (1 to 2 grains).