=Magnesii Chloridum (Magnes. Chlorid.), Magnesium Chloride, N.F.=--MgCl{2} + 6H{2}O. Colorless transparent crystals or white translucent pieces; deliquescent in moist air. Very soluble in water (1:0.6) and soluble in alcohol. ACTION AND USES: Similar to but without advantage over magnesium sulphate. DOSAGE: 15 Gm. or 4 drachms (N.F.). =*Magnesii Citras, Magnesium Citrate.= _*Liquor Magnesii Citratis (Liq. Mag. Cit.), Solution of Magnesium Citrate, U.S.P._--Magnesium citrate corresponding to not less than 1.5 per cent. of magnesium oxide. USES: Efficient and not distasteful mild saline laxative. DOSAGE: 350 Cc. or 12 fluidounces (1 bottle) (U.S.P.). =Magnesii Hydroxidum, Magnesium Hydroxide.= _Magma Magnesiae (Magma Mag.), Magnesia Magma, U.S.P._ (Milk of Magnesia).--A suspension of magnesium hydroxide in water [equivalent to about 7% Mg(OH){2}] forming a thick, white liquid. USES: Widely used as mild alkaline laxative and tooth wash. DOSAGE: 10 Cc. or 2-1/2 fluidrachms (U.S.P.). =*Magnesii Oxidum (Mag. Oxid.), Magnesium Oxide, U.S.P.= (Magnesia, Calcined Magnesia, Light Magnesia).--MgO (not less than 96%). A white, bulky, odorless powder with an earthy but not saline taste. Almost insoluble in water; insoluble in alcohol. ACTION AND USES: Useful antacid and laxative. DOSAGE: 2 Gm. or 30 grains (U.S.P.). =Magnesii Oxidum Ponderosum (Mag. Oxid. Pond.), Heavy Magnesium Oxide, U.S.P.= (Heavy Magnesia).--MgO (96%). White, dense powder. ACTION AND USES: Used like magnesium oxide. DOSAGE: 2 Gm. or 30 grains (U.S.P.). =*Magnesii Sulphas (Mag. Sulph.), Magnesium Sulphate, U.S.P.= (Epsom Salt).--MgSO{4} + 7H{2}O. Small, colorless, odorless crystals, with a cooling, saline, bitter taste. Freely soluble in water (1:1); almost insoluble in alcohol. ACTION AND USES: One of the most active of the saline cathartics. DOSAGE: 15 Gm. or 4 drachms (U.S.P.), in solution. A solution containing 1 Gm. of salt in each Cc. may be given, 5 Cc. every hour until a laxative effect is secured. This should usually be diluted with water. _Liquor Magnesii Sulphatis Effervescens (Liq. Mag. Sulph. Eff.), Effervescent Solution of Magnesium Sulphate, N.F._--Magnesium sulphate (about 7%) with syrup of citric acid, potassium citrate and water. DOSAGE: The contents of a bottle, about 350 Cc. or nearly 12 fluidounces (N.F.). =Maltum (Maltum), Malt, U.S.P.=--Malted barley, capable of converting not less than 5 times its weight of starch into sugars. Yellowish grains with a characteristic odor and a sweet taste. ACTION AND USES: Used to digest starch by its diastase. _Extractum Malti (Ext. Malt.), Extract of Malt, U.S.P._--Syrupy liquid. DOSAGE: 15 Gm. or 4 drachms (U.S.P.). =Malvae Folia (Malv. Fol.), Mallow Leaves, N.F.= ACTION AND USES: Demulcent "herb tea," without definite indications for its use.