Boric acid may be applied pure to wounds and sores or mixed with other suitable drugs as a dusting powder. Equal parts of boric acid and zinc oxide make a cheap and effective healing powder; to an itching wound the addition of an equal quantity of acetanilide increases its value. A saturated solution (four per cent) is useful as a vaginal and uterine douche and to flush the bladder in cystitis.
ACIDUM CARBOLICUM CRUDUM—CRUDE CARBOLIC ACID
Derivation.—A liquid consisting of several different constituents of coal tar, particularly creosol and phenol, obtained by fractional distillation.
Properties.—A nearly colorless, or reddish-brown liquid of a strong disagreeable and creosote-like odor, and gradually turning darker on exposure to the air and light. Soluble in fifteen parts of water.
PHENOL—ACIDUM CARBOLICUM—CARBOLIC ACID
Derivation.—Obtained from crude carbolic acid by agitation with caustic soda, heating to 338° F., and adding hydrochloric acid. Then by agitation with sodium chloride, digestion with calcium chloride, and distillation at a temperature between 336° F. and 374° F. and finally by crystallization.
Properties.—Phenol in its pure state is a solid at ordinary temperatures, crystallizing in minute plates or long rhomboidal needles, white or colorless, of a peculiar odor recalling that of creosote, and an acrid burning taste. It is likely to be colored pinkish or brown under the influence of light and air. Soluble in about 19.6 parts of water, and very soluble in alcohol, ether, chloroform, glycerin, fixed and volatile oils.
Actions.—Phenol in large and undiluted doses is an irritant and narcotic poison; it is used as an antiseptic, parasiticide, antiferment and sometimes used as a local anaesthetic or anodyne in a 2 to 5 per cent solution; also as a caustic, but should not be used as a caustic as a burn from it heals very slowly.
Uses.—Internally as a gastric sedative in small doses for vomiting in dogs; is administered in various contagious and infectious diseases with the view of preventing or arresting the development of micro-organisms; it coagulates albumen, is not nearly so active as bichloride of mercury; 1 part to 500 parts of water prevents the growth of anthrax and other bacilli. Full doses produce gastro-enteritis, and collapse, which may end fatally; it is a muscular and nerve paralyzer, both internally and externally, it kills by paralyzing the muscles of respiration and the heart. It is chiefly eliminated from the system by the kidneys, giving the urine a brownish color.
In Surgery.—A three to five per cent solution is used for washing out wounds, a two to three per cent for hands, and for itching of the skin, carbolic acid three or four drachms, glycerine two ounces to one pint of water. Do not use over large surface on dogs and not at all on cats.