Ammoniacum,—Ammoniac.

Source and Composition. Ammoniac is a gum-resinous exudation from Dorema Ammoniacum, a Persian plant of the nat. ord. Umbelliferae. It contains a Volatile Oil (not sulphuretted), a Gum and a Resin. Dose, gr. x-xxx.

Preparations.

Emulsum Ammoniaci,—4 per cent. Dose, ℥ss-j.

Emplastrum Ammoniaci cum Hydrargyro, Ammoniac Plaster with Mercury,—has of Ammoniac 72, Mercury 18 per cent.

Action and Uses, are similar to those of Asafetida, but it is much less powerful. It is not much used. In-

Chronic Bronchial Affections, especially of the aged,—the Emulsion with Ammonium Chloride or Carbonate, is extremely useful, facilitating expectoration and lessening wheezing.

Asthma, spasmodic and hysterical,—it is highly useful, if combined with a little Hyoscyamus or Conium.

Glandular Enlargements and indolent inflammatory swellings,—the plaster as a stimulating alterative and resolvent.

A Compend of Materia Medica, Therapeutics, and Prescription Writing, 1902, by Sam'l O. L. Potter, M.D., M.R.C.P.L.