ACTION AND USES: Analgesic, antipyretic and, in excessive doses, a cardiac depressant. Used particularly to relieve headache and neuralgic pains. A habit-forming drug. If used over a long period of time, it may produce a severe anemia. DOSAGE: 0.2 Gm. or 3 grains (U.S.P.) in powders which may be placed in capsules, or tablets which should be crushed before swallowing. It is well to begin with 0.1 Gm. or about 1-1/2 grains, and to repeat cautiously. _Pulvis Acetanilidi Compositus (Pulv. Acetanil. Co.), Compound Acetanilid Powder, N.F._--Acetanilid (70%), caffeine (10%) and sodium bicarbonate (20%). USES: Irrational acetanilid preparation. The caffeine does not diminish the toxicity, nor does the bicarbonate increase the solubility of acetanilid, as was at one time supposed. DOSAGE: 0.3 Gm. or 5 grains (N.F.). =Acetonum (Aceton.), Acetone, U.S.P.= (Dimethyl-Ketone). A colorless liquid, with an ethereal odor and a pungent sweetish taste. Miscible with water, alcohol, ether and chloroform. ACTION AND USES: Pharmaceutic solvent. =*Acetphenetidinum (Acetphen.), Acetphenetidin, U.S.P. (Phenacetin).=--C{6}H{4}(OC{2}H{5}).NH.CH{3}CO. White, odorless, slightly bitter, crystalline scales or powder. Very slightly soluble in water (1:1310), soluble in alcohol (1:15) and in chloroform (1:14). ACTION AND USES: Analgesic, antipyretic and, in excessive doses, a cardiac depressant. Used particularly for the relief of headache and neuralgic pains and in the treatment of mild fevers. A habit-forming drug. If used for a long period of time, it may produce a severe anemia. DOSAGE: 0.3 Gm. or 5 grains (U.S.P.), in powders or capsules. If small doses fail to relieve headache, larger doses are also usually ineffective. =*Acidum Aceticum (Acid. Acet.), Acetic Acid, U.S.P.=--Acetic acid CH{3}.COOH (about 36.5%). ACTION AND USES: Caustic and rubefacient. In the form of vinegar, is antidote to alkalies. _Acidum Aceticum Dilutum (Acid. Acet. Dil.), Diluted Acetic Acid, U.S.P._--CH{3}COOH (about 6%). DOSAGE: 2 Cc. or 30 minims. _Acidum Aceticum Glaciale (Acid. Acet. Glac.), Glacial Acetic Acid, U.S.P._--CH{3}COOH. A colorless liquid, with a vinegar-like odor and a pungent, sour taste. Miscible with water or alcohol. *=Acidum Benzoicum (Acid. Benz.), Benzoic Acid, U.S.P.=--C{6}H{5}.COOH. Obtained from benzoin or prepared synthetically. Lustrous, almost colorless scales or needles, with a pungent, acid taste. Slightly soluble in water (1:275) and freely soluble in alcohol (1:2.3); also readily soluble in solutions of alkali hydroxides or carbonates with the production of alkali benzoates. ACTION AND USES: Mild antiseptic and diuretic. DOSAGE: 0.5 Gm. or 8 grains (U.S.P.), best given in the form of soluble benzoates (see under =Sodii Benzoas=). *=Acidum Boricum (Acid. Bor.) Boric Acid, U.S.P.= (Boracic Acid).--H{3}BO{3}.