Characters. - In colourless crystals which become slightly yellow by exposure to the air, and have a pungent saline taste.

Preparation. - Vide p. 635.

Reactions. - Its solution gives the reactions of ammonia (p. 634), and a bromide (p. 594).

Dose. - 2 to 20 grains.

Uses. - The bromide of ammonium has been employed for the same purposes as the bromide of potassium. It may be used in cases where the bromide of potassium appears to cause depression, either instead of the potassium salt, or mixed with it, and the mixture of bromide of potassium with bromide of ammonium has been supposed to have a better action than either salt alone. The best proportion is said to be that of 1 part of bromide of potassium, 1 of bromide of sodium, and 1/2 of bromide of ammonium.1

U.S.P. Lithii Bromidum. Bromide of Lithium. (LiBr; 86.8.)

Characters. - A white granular salt, very deliquescent, odourless, having a very sharp, somewhat bitter taste, and a neutral reaction.

Preparation. - Vide p. 631.

Solubility. - Very soluble in water and in alcohol.

Reactions. - Those of lithium (p. 630) and of a bromide (p. 594).

Dose. - 15-30 grs.

Action. - The same as that of bromide of potassium. It is said by some to have a stronger hypnotic action than the other bromides, but by others to be less effective than the potassium salt.

Uses. - The same as those of potassium bromide. It may be preferable to the potassium salt in the irritability of gouty subjects.

U.S.P. Calcii Bromidum. Bromide of Calcium. (CaBr2; 199.6.)

Characters. - A white granular salt, very deliquescent, odourless, having a pungent saline and bitter taste, and a neutral reaction.

Preparation. - By adding milk of lime to a boiling solution of ammonium bromide.

Reactions. - An aqueous solution of the salt yields the reactions of calcium (p. 646) and a bromide.

Uses. - 15 to 30 grains (1 to 2 gm.).

Dose. - The same as those of potassium bromide (p. 553). It is said not to depress like the potassium bromide.

U.S.P. Zinci Bromidum. - Vide p. 672.

1 Erlenmeyer, Centbl. f. Nervenhk. 1884. No. 4.