Extractum Guaranae Fluidum (U. S. P.)—Fluid Extract of Guarana.
Related entry: Guarana (U. S. P.)—Guarana
Preparation.—"Guarana, in No. 80 powder, one thousand grammes (1000 Gm.) [2 lbs. av., 3 ozs., 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 two hundred cubic centimeters (200 Cc.) [6 fl℥, 366♏] 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 proportions of alcohol and water as before, until the guarana is exhausted. Reserve the first eight hundred cubic centimeters (800 Cc.) [27 fl℥, 25♏] of the percolate. Distill off the alcohol from the remainder by means of a water-bath, and evaporate the residue 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 Guarana). This is a dark reddish-brown fluid, of an astringent bitter taste. If too little alcohol be used in the menstruum, as in former processes, a heavy precipitate falls. Glycerin, in our opinion, is desirable as a part of the menstruum, both as a solvent and as a preventive of precipitation. Dose, from 20 to 60 minims.