Hydrastis Rhizoma. Hydrastis Rhizome. (Golden Seal.) The dried rhizome and roots of Hydrastis Canadensis. The rhizome is tortuous, often branched, 1/2 - 1 1/2 inch long, l/8 - 1/2 inch thick; yellowish-brown, on the upper surface ascending branches and on the lower numerous thin brittle roots: slight but characteristic odour; taste bitter. Active principles the alkaloids, hydrastine and berberine.

1Extractum Hydrastis Liquidum. Dose, 5 - 15 min.; 0.3 - 1 c.c. An alcoholic extract.

2Tinctura Hydrastis. Dose, 30 - 60 min.; 2 - 4 c.c. - 10; Alcohol 60%, 100: by percolation.

Hydrogenii Peroxidi (See Liquor Hydrogenii Peroxidi, p. 71.)

Hyoscyami Folia. Hyoscyamus (Henbane) Leaves. The fresh leaves, flowers, and branches of Hyoscyamus niger, also the same dried. The leaves vary in length but are seldom more than 10 inches long; oblong, with a conspicuous mid-rib, pale green, with hairs especially along the veins and on the under surface. The flower yellowish, with purplish veins. The herb has a strong characteristic odour, and a bitter slightly acrid taste. Active principles the alkaloids hyoscine and hyoscyamine.

1Extractum Hyoscyami Viride. Dose, 2 - 8 grs.; 1 - 5 dgms. The juice expressed from the fresh herb evaporated to a soft extract.

1Pilula Colocynthidis et Hyoscyami (see Colocynthis, 54).

3Succus Hyoscyami. Dose, 30 - 60 min.; 2 - 4 c.c. Fresh expressed juice, 75; Alcohol, 25.

1Tinctura Hyoscyami. Dose, 30 - 60 min.; 2 - 4 c.c. Dried leaves and tops, 10; Alcohol, 45%, 100: by percolation.

Hyoscinæ Hydrobromidum. (Scopolamine Hydrobromide.) Dose 1/200 - 1/100 gr.; 1/3 - 2/3 mgms.

This alkaloid is also obtained from Datura alba and Scopola. Colourless, transparent crystals, odourless,; taste acrid and slightly bitter. Soluble 1 in 2 of water, 1 in 13 of alcohol. Incompatibles, as for alkaloids but is not precipitated by bicarbonates or ammonium carbonate; decomposed by alkalies or water if warmed.

Hyoscyaminæ Sulphas. Dose, 1/200 - 1/100 gr.; 1/3 - 2/3 mgms. A crystalline powder, odourless, deliquescent, with a bitter, acrid taste. Soluble 1 in 1/2 of water, 1 in 4.5 of alcohol, very slightly in ether or chloroform. Incompatibles as for hyoscine.

Infusae. (The following with a dose of 1/2 - 1 fl. oz. Aurantii, Aurantii Comp., Calumbæ, Caryophylli, Cascarillæ, Chiratæ, Cinchonæ Acidum, Gentianæ Comp., Quassiæ, Rhei, Rosæ Acidum, Scoparii, Senegæ, Serpentariæ, Uvæ Ursi; with a dose of 1/2 - 2 fl. oz. Sennæ; with a dose of 1 - 2 fl. oz. Buchu, Cuspariæ, Ergotæ, Krameriæ, Lupuli; with a dose of 2-4 fl. dr. only, Digitalis.)

Injectiones Hypodermicae. (The following with a dose of 2 - 5 min. Cocainæ, Morphinæ; with a dose of 3 - 10 min. Ergotæ; with a dose of 5-10 min. Apomorphinæ.)