DOSAGE: 0.003 Gm. or 1/20 gr. (U.S.P.). =Diacetylmorphinae Hydrochloridum (Diacetylmorph. Hydrochl.), Diacetylmorphine Hydrochloride, U.S.P.= (Diacetylmorphine Chloride; Heroin Hydrochloride). White, odorless, bitter powder. Freely soluble (1:2) in water and soluble in alcohol (1:11). DOSAGE: 0.003 Gm. or 1/20 grain (U.S.P.). _Elixir Terpini Hydratis et Diacetylmorphinae (Elix. Terpin. Hyd. et Diacetylmorph.), Elixir of Terpin Hydrate and Diacetylmorphine, N.F._ (Elixir Terpini Hydratis cum Heroina N.F. III).--Diacetylmorphine hydrochloride (0.027%) and elixir of terpin hydrate. Absolute alcohol content about 42 per cent. DOSAGE: 4 Cc. or 1 fluidrachm (N.F.). This dose contains about 0.001 Gm. or 1/60 grain of diacetylmorphine hydrochloride, and about 0.07 Gm. or 1-1/6 grains of terpin hydrate. =Diastasum (Diastasum), Diastase, U.S.P.=--A mixture containing amylolytic enzymes from malt. Yellowish-white, odorless, tasteless powder or scales. Soluble in water; almost insoluble in alcohol. ACTION AND USES: May be mixed with starchy foods to assist their conversion into sugar. DOSAGE: 0.5 Gm. or 8 grains (U.S.P.). =*Digitalis (Digit.), Digitalis, U.S.P.= (Foxglove, Digitalis Leaves, Digitalis Folium P.I.). ACTION AND USES: Direct cardiac stimulant and diuretic. Used in cardiac decompensation. Most effective when the heart action is rapid and very irregular (auricular fibrillation). Effective in the treatment of edema only when the latter is due to impaired circulation. Very likely to cause disturbance of gastro-intestinal tract. DOSAGE: 0.06 Gm. or 1 grain (U.S.P.). Physicians are advised to specify preparations which have been biologically assayed. _Fluidextractum Digitalis (Fldext. Digital.), Fluidextract of Digitalis, U.S.P._--Digitalis (100%). May be biologically assayed by producing death in the frog. Absolute alcohol content about 70 per cent. DOSAGE: 0.05 Cc. or 1 minim (U.S.P.).--Physicians should specify the biologically assayed fluidextract. _*Infusum Digitalis (Inf. Digit.), Infusion of Digitalis, U.S.P._--Digitalis (1.5%), cinnamon water and water. This is an effective form of digitalis, but has no advantage over tinctures of proper potency, and is not so conveniently standardized. DOSAGE: 4 Cc. or 1 fluidrachm (U.S.P.). _Pilulae Digitalis, Scillae et Hydrargyri (Pil. Digit. Scill. et Hydrarg.), Pills of Digitalis, Squill and Mercury, N.F._ (Niemeyer Pills for Dropsy, Guy's Pills).--Each pill contains digitalis, squill and mass of mercury (each 0.065 gm. or 1 grain) with clarified honey. USES: Popular but needlessly complex cardiac diuretic. DOSAGE: 1 pill (N.F.). _*Tinctura Digitalis (Tr. Digit.), Tincture of Digitalis, U.S.P._ (Digitalis Tinctura P.I.).--Digitalis (10%) in alcohol and water. May be biologically assayed by producing death in frogs. Absolute alcohol content about 70 per cent.