_*Liquor Acidi Arsenosi (Liq. Acid. Arsen.), Solution of Arsenous Acid, U.S.P._ (Hydrochloric Solution of Arsenic, "Solution of Arsenic Chloride").--Arsenic trioxide (1%) in diluted hydrochloric acid (5%) and water. DOSAGE: 0.2 Cc. or 3 minims. =*Asafoetida (Asafoet.), Asafetida, U.S.P.= (Gum Asafetida).--A gum resin. Should be 60% soluble in alcohol. ACTION AND USES: Used as a carminative and also in the treatment of hysteria, the action being psychic. DOSAGE: 0.25 Gm. or 4 grains (U.S.P.), in pills. _Emulsum Asafoetidae (Emuls. Asafoet.), Emulsion of Asafetida, U.S.P._ (Milk of Asafetida).--Asafetida (4%) in water. USES: Used especially as enema in tympanites. DOSAGE: 15 Cc. or 4 fluidrachms (U.S.P.). _Pilulae Asafoetidae (Pil. Asafoet.), Pills of Asafetida, U.S.P._--Each pill contains asafoetida (0.2 Gm. or 3 grains), and soap. DOSAGE: 2 pills (U.S.P.). _Tinctura Asafoetidae (Tr. Asafoet.), Tincture of Asafetida, U.S.P._--Asafetida (20%) in alcohol. Absolute alcohol content about 81 per cent. DOSAGE: 1 Cc. or 15 minims (U.S.P.). =Asarum (Asar.), Asarum, N.F.= (Canada Snake-Root. Wild Ginger).--Rhizome. ACTION AND USES: Carminative and flavor; similar to but without advantage over ginger. DOSAGE: 2 Gm. or 30 grains (N.F.). _Syrupus Asari Compositus (Syr. Asar. Co.), Compound Syrup of Asarum, N.F._--Asarum (6.2%), fluidextract of ipecac (0.3%), alcohol, cochineal and potassium carbonate in syrup. DOSAGE: 4 Cc. or 1 fluidrachm (N.F.). =Asclepias (Asclep.), Asclepias, N.F.= (Pleurisy Root). ACTION AND USES: Obsolete domestic remedy for pleurisy, also used as diaphoretic. Probably without value. DOSAGE: 2 Gm. or 30 grains (N.F.). _Fluidextractum Asclepiadis (Fldext. Asclepiad.), Fluidextract of Asclepias, N.F._--Asclepias (100%). Absolute alcohol content about 40 per cent. DOSAGE: 2 Cc. or 30 minims (N.F.). =*Aspidium (Aspidium), Aspidium, U.S.P.= (Male Fern).--The rhizome of certain ferns. ACTION AND USES: Used as a teniacide in the form of oleoresin. _*Oleoresina Aspidii (Oleores. Aspid.), Oleoresin of Aspidium, U.S.P._ (Oleoresin of Male Fern). DOSAGE: 2 Gm. or 30 grains (total dose in a day, U.S.P.), which may be given singly or in repeated, divided doses, at intervals of fifteen minutes, in capsules containing 0.3 Gm. or 5 grains, or in emulsion. Larger doses may be given to robust persons. Special caution is necessary in giving it to anemic or debilitated persons. The patient should be prepared by a light diet or fasting for twenty-four hours. The drug should be given early in the morning, preceded by a saline cathartic, and the last dose followed in three hours by a saline laxative. Caution:--Castor oil or other fixed oils should not be used in connection with oleoresin of aspidium, as they favor the absorption of the active principle. =Aspidosperma (Aspidosp.), Aspidosperma, U.S.P.= (Quebracho).--A bark.