Extractum Arnicae Radicis Fluidum (U. S. P.)—Fluid Extract of Arnica Root.
Related entry: Arnica.—Arnica
Preparation.—"Arnica root, in No. 60 powder, one thousand grammes (1000 Gm.) [2 lb. av., 3 oz., 120 grs.]; alcohol, water, each, a sufficient quantity, to make one thousand cubic centimeters (1000 Cc.) [33 fl℥, 391♏︎]. Mix seven hundred and fifty cubic centimeters (750 Cc.) [25 fl℥, 173♏︎] of alcohol with two hundred and fifty cubic centimeters (250 Cc.) [8 fl℥, 218♏︎] of water, and, having moistened the powder with four hundred cubic centimeters (400 Cc.) [13 fl℥, 252♏︎] of the mixture, pack it firmly in a cylindrical percolator; then add enough menstruum to saturate the powder, and leave a stratum above it. When the liquid begins to drop from the percolator, close the lower orifice, and having closely covered the percolator, macerate for 48 hours. Then allow the percolation to proceed, gradually adding menstruum, using the same proportion of alcohol and water as before, until the arnica root is exhausted. Reserve the first nine hundred cubic centimeters (900 Cc.) [30 fl℥, 208♏︎] of the percolate, and evaporate the remainder, at a temperature not exceeding 50° C. (122° F.), to a soft extract; dissolve this in the reserved portion, and add enough menstruum to make the fluid extract measure one thousand cubic centimeters (1000 Cc.) [33 fl℥, 391♏︎]"—(U. S. P.).
Description, Medical Uses, and Dosage.—(See Arnica). A reddish-brown fluid possessing the bitter, acrid taste of arnica root. Dose, 10 to 30 minims.
Related Preparation.—EXTRACTUM ARNICAE FLORUM FLUIDUM (N. F.), Fluid extract of arnica flowers. Formulary number, 141: "From the flower heads of Arnica montana, Linné (Arnica). Process A (see F. 135). No. 40 powder. Menstruum: Diluted alcohol"—(Nat. Form).
