2. (Ph. E. Baden and U. S.) From dried rhatany root (Krameria triandria), as EXTRACT OF BISTORT—P. Cod.
3. (Ph. Bor.) By two successive macerations in boiling water of 24 hours each, and evaporating at a temperature not exceeding 165° Fahr.
Obs. Extract of rhatany is astringent and tonic.—Dose, 10 to 20 gr. A large quantity of this extract, of very inferior quality, is imported from Brazil, and other parts of South America. It is kept in two states, hard and soft; the former resembles KINO, and is often sold for it; the latter is chiefly consumed by the manufacturers and ‘improvers’ of port wine.
Extract of Rhu′barb. Syn. Extractum rhei (B. P.), L. Prep. 1. (B. P.) Rhubarb (sliced or bruised), 8 oz.; rectified spirit, 5 oz.; distilled water, 50 oz.; macerate 4 days, strain, and set it aside, that the fæces may subside; next decant the clear portion, strain, mix, and evaporate to a proper consistence over a water bath at 160° F.
2. (Ph. L.) As EXTRACT OF CINCHONA—Ph. L. (nearly). “The extract is obtained of finer quality by evaporation in a vacuum with a gentle heat.” The Baden formula is similar.
Obs. This extract is usually prepared by decoction from inferior and damaged rhubarb, picked out from the chests on purpose; hence the inferior quality of the extract of the shops. When made of good Turkey, or even East India rhubarb, it is a very valuable preparation.—Dose. As a stomachic, 5 to 10 gr.; as a purgative, 10 gr. to 1⁄2 dr. It is seldom exhibited alone. Product. 5%.
3. (Fluid; Liquor of rhubarb, Essence of r.; Liquor rhei, Extractum rhei fluidum, L.)—a. (W. Procter.) Rhubarb (in coarse powder), 8 oz.; mix it with an equal bulk of coarse sand, and moisten it with dilute alcohol (sp. gr. ·935, = 13 u. p.) to form a pasty mass; in a short time introduce it into a percolator, shake it until uniformly settled, and cover it with cloth or paper; then pour on the rest of the spirit (the remainder of 2 pints) until the product has little odour or taste of the root; next gently evaporate the tincture to 51⁄2 fl. oz., and add sugar, 5 oz., when the whole should measure 8 fl. oz.—Dose, 15 to 30 drops.
b. (Ph. U. S.) As the last, adding of oils of fennel and anise, of each 4 drops; (dissolved in) tincture of ginger, 4 fl. dr.
4. (Compound; Extractum rhei compositum, E. panchymagogum, L.—Ph. Bor.) Extract of rhubarb, 3 dr.; extract of aloes, 1 dr. (softened with) water, 4 dr.; mix, and add of soap of jalap, 1 dr. (dissolved in) proof spirit, 4 dr.; lastly, evaporate to an extract, dry this in a warm place, and powder. Stomachic and purgative.—Dose, 4 to 20 gr.
Extract of Rue. Syn. Extractum rutæ, E. foliorum rutæ, L. Prep. 1. From rue leaves (Rutæ graveolens), as EXTRACT OF HOPS—Ph. L.