Infusion of Cincho′na

Syn . Infusion of bark , Infusum cinch onæ , L. Prep. 1. (B. P.) Yellow cinchona (calisaya) bark, in coarse powder, 1 oz.; boiling distilled water, 1 pint; infuse for two hours in a covered ve el, and strain. Obs. Infusion of bark is tonic and stomachic, and in very large doses febrifuge. It is an extremely useful medicine in dyspepsia, debility, and during convalescences, and is often a valuable adjunct to more active remedies. Like the decoction, it is most energetic when strained whilst hot. The addition of 1 fl. dr. of diluted sulphuric acid to the water before pouring it on the bark increases its solvent power, and, consequently the strength of the infusion.— Dose , 1 to 3 fl. oz. 2. (Concentrated; Infusum cinch onæ con centra tum , L.)— a. Yellow bark (coarsely powdered), 4 lbs.; boiling water, 8 lbs.; digest for 12 hours, expre the liquid, add rectified spirit, 2 lbs., and after 24 hours’ repose decant the clear portion. b. Yellow bark (in coarse powder), 4 lbs.; cold water, 8 lbs.; rectified spirit, 2 lbs.; dilute sulphuric acid, 4 fl. oz.; mix the fluids, and either macerate the bark in them for a week in a closed ve el, or proceed by the method of displacement. Very superior. Obs. 1 fl. dr. of either of the above, added to 7 fl. dr. of water, produces an extemporaneous infusion of cinchona resembling that of the pharma copœia. The concentrated preparation of the Ph. L. being more than 8 times the usual strength, is placed amongst Liquors . 3. From PALE BARK :— a. (Ph. L., Infusion of pale cinchona ; Infusum cinch onæ pallidæ —Ph. L.) From pale bark, as INFUSION OF CINCHONA —Ph. L. b. (Ph. D.; Infusum cinch onæ —Ph. D.) Crown or pale bark, 1 oz.; boiling water, 1 ⁄ 2 pint; infuse 1 hour in a covered ve el, and strain through paper. Obs. “This infusion is inferior to the preceding” (from yellow bark) “in activity, and is a very unnece ary one. It is said to oppre the stomach le than that of the other cinchona bark; the reason is obvious—it is weaker.” (Pereira.) c. Concentrated; Infusum cinch onæ pallidæ con centra tum , L. As CONCENTRATED INFUSION OF CINCHONA , but using pale bark. The concentrated preparation of the Ph. L. will be found under Liquors .