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A concentrated alcohol solution of a drug of such strength that each milliliter contains the equivalent of one gram of the dry form of the drug.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Pharmacology) an alcoholic solution of a vegetable drug, one millilitre of which has an activity equivalent to one gram of the powdered drug
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈflu ɪdˈɛk strækt)

a liquid preparation of a drug containing in each cubic centimeter the medicinal activity of one gram of the powdered drug.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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The use of another bioassay, a rather curious one, is mentioned in a 1972 paper from the Journal of Pharmaceutical Sciences titled "Biological and chemical evaluation of a 43-year-old sample of Cannabis fluidextract" authored by Kubena RK, Barry H, Segelman AB, Theiner M, and Farnsworth NR (Jan;61(l): 144-5) in which not only did the chemical constituents of a 43-year-old cannabis liquid extract hold up after room temperature storage over that time, but it also produced the "characteristic ataxia in dogs" after oral administration!
Trade name Pharmaceutical Active Igredients form Althym[R] Syrup Althaea officinalis fluidextract (0,5%), Thymus vulgaris fluid extract Apple-lite[R] Tablets Each tablet contains: Apple fibres 500mg (from-apple cuticle).
Furthermore, the author provides fluidextract worksheets and conversion tables in the appendix to assist readers in their plant preparations.
lanceolata fluidextract. The ACh-induced contractions of the guinea-pig ileum and the barium-induced contractions of the trachea were reduced to 45%.