Transparent crystals or white powder, odorless and having a cooling, saline taste. Very soluble in water (1:0.9). ACTION AND USES: Saline cathartic, of relatively unobjectionable taste. DOSAGE: 10 Gm. or 2-1/2 drachms (U.S.P.) in water. _*Pulvis Effervescens Compositus (Pulv. Eff. Co.), Compound Effervescing Powder, U.S.P._ (Seidlitz Powder).--The blue paper contains sodium bicarbonate (2.5 Gm.) and potassium and sodium tartrate (7.5 Gm.). The white paper contains tartaric acid (2.16 Gm.). DOSAGE: 1 set of two powders (U.S.P.). =*Potassii Hydroxidum (Pot. Hydrox.), Potassium Hydroxide, U.S.P.= (Caustic Potash, Potassium Hydrate).--KOH (not less than 85%). Dry white or nearly white, odorless, deliquescent, hard and brittle flakes, masses or sticks. Very soluble in water (1:0.9) and freely soluble in alcohol (1:3). ACTION AND USES: Internally, an antacid, but objectionable for it is more irritant than the bicarbonate and without advantage over the latter. Externally, caustic and solvent, but too diffluent. _*Liquor Potassii Hydroxidi (Liq. Pot. Hydrox.), Solution of Potassium Hydroxide, U.S.P._ (Liquor Potassae, Solution of Potassa).--KOH (not less than 4.5%). DOSAGE: 1 Cc. or 15 minims (U.S.P.). _Potassa cum Calce (Pot. c. Calc.), Potassa with Lime, N.F._--Potassium hydroxide (50%) and calcium oxide. USES: Caustic. =Potassii Hypophosphis (Pot. Hypophos.), Potassium Hypophosphite, U.S.P.=--KH{2}PO{2}. (Caution should be observed in handling this product to avoid explosion.) White, opaque deliquescent plates, crystalline masses or granular powder, odorless and having a pungent, saline taste. Very soluble in water (1:0.6) and freely soluble in alcohol (1:9). ACTION AND USES: Introduced in common with other hypophosphites as a cure for tuberculosis; since used as "nerve-foods." There is no proof that the hypophosphites exert any physiologic effect, influence any pathologic process, or have any food value. DOSAGE: 0.5 Gm. or 8 grains (U.S.P.). =*Potassii Iodidum (Pot. Iod.), Potassium Iodide, U.S.P.=--KI. Transparent, translucent or opaque crystals or white granular powder, with a pungent, saline, afterward bitter taste. Very soluble in water (1:0.7) and soluble in alcohol (1:22). Incompatible with mineral acids and oxidizing agents and should not be prescribed in solution with alkaloids or alkaloid-containing drugs. ACTION AND USES: Saline expectorant, especially in asthma and chronic bronchitis; diuretic; antisyphilitic; "alterative" in rheumatic conditions, sclerosis, etc. DOSAGE: 0.3 Gm. or 5 grains (U.S.P.); best administered in simple solution and well diluted; in lues the dose should be gradually increased to the limit of tolerance. _Unguentum Potassii Iodidi (Ung. Pot. Iod.), Ointment of Potassium Iodide, N.F._--Potassium iodide (10%), sodium thiosulphate (1%), water and benzoinated lard.