Helcomen

Basic bismuth dibromo-oxy-naphtholate. An insoluble, odourless, yellow powder. Used as a substitute for iodoform.

Helmitol is hexamethylenamine-anhydromethylene citrate, a white, crystalline powder, with acid taste, which dissolves in water to the extent of I in 14. A urinary antiseptic. Dose:15 grains.

Hemisine

A trade-name for the active principle of the suprarenal gland.

Heroin

A diacetyl derivative of morphine, which occurs in the British Pharmacopoeia, 1914, as diamorphine hydrochloride.

Hetocresol is metacresol cinna-mate, a white, crystalline powder, insoluble in water, but soluble in ether. Used per se as a dusting-powder, or as an ether spray (3SS. to ).

Hetol is a fancy name for sodium cinnamate, which is used in tuberculosis by intravenous injection. Dose:1/25 to 1/2 grain.

Hetralin is dioxybenzol-hexa-methylene-tetramine. It is a crystalline body, soluble in water (1 in 14). Used in cystitis as a urinary antiseptic. Dose:7 1/2 to 15 grains.

Hexal

Hexamine sulpho-sali-cylate. Similar in action to hexamine. Dose:15 grains. Also called Neo-hexal.

Hexanatrine

A mixture of hexamine and sodium acid phosphate in 5-grain tablets.

Holocaine Hydrochloride

The white, crystalline salt of a synthetic body (made by interaction of phen-acetin and paraphenetidin). Used as a substitute for cocaine in ophthalmic practice as a 1-per-cent. solution in water. Its solubility is 1 in 45 of water.

Honthin

Atannate of albumin. A tasteless and odourless powder used as an intestinal astringent. Dose:10 to 30 grains.

Hopogan is a trade-name of magnesium peroxide, used in anaemia and in gastric troubles. Insoluble in water. Dose:20 to 60 grains.

Hydracetin and Pyrodin are the trade-names of acetylphenylhydra-zine, which therapeutists regard as a poison rather than a therapeutic agent, although it was introduced as an antipyretic. Used as 10-per-cent. vaseline ointment in psoriasis.

Hydramyl

A name for amyl hydride or rhigolene (an impure variety), the lightest fraction obtained in the distillation of petroleum spirit. Must be distinguished from Amylene Hydrate {q.v.).

Hydrargyrol

Reddish - brown scales of mercury paraphenolsul-phonate, containing 53 per cent. of the metal, and soluble in water and glycerin. An antiseptic of similar power to mercuric chloride, but non-caustic and does not coagulate albumen. See also Asterol.

Hydrocaffeine

A derivative of caffeine, identical with 1, 3, 7, trimethyl uric acid. Needle-shaped crystals, easily soluble in water and in sodium-benzoate solution. Dose: 8 grains as a diuretic.

Hydronaphthol

A proprietary antiseptic in greyish laminae, sparingly soluble in water (1 in 1,150) but dissolving freely in alcohol, glycerin, and fixed oils.