Coloring agents are substances employed to communicate their peculiar color to pharmaceutical preparations. They include saffron, cochineal, red saunders, etc., etc.; and in dental practice they are used for coloring dentrifrices, such as rose pink.

In addition to the general classes mentioned, there are certain sub-classes recognized, which have not been specially referred to in the preceding definitions, as follows: -

Absorbents,

Anodynes,

Antemetics,

Anthridrotics,

Antiperiodics,

Antipyretics,

Antiseptics,

Aromatic Bitters,

Carminatives,

Caustics,

Cauterants,

Constringents,

Counter-irritants,

Desiccatives,

Detergents,

Deodorizers,

Diluents,

Discutients,

Disinfectants,

Emollients,

Errhines,

Escharotics,

Expectorants,

Evacuants,

Excitants,

Febrifuges,

Germicides,

Hemostatics,

Hypersthenics,

Hypnotics,

Laxatives,

Nervines,

Nutritives,

Purgatives,

Refrigerants,

Resolvents,

Restoratives,

Sialogogues,

Stimulants,

Styptics,

Vesicants.

Absorbents

Absorbents, known also as Desiccatives, are medicinal agents capable of checking secretions, and drying up secretions, or discharges from ulcers and suppurating wounds. Included in this class are tannic acid, oxide of zinc, charcoal, subnitrate of bismuth, starch, powdered galls, magnesia, powdered myrrh, carbonate of lime, etc., etc.

Anodynes Or Analgesics

Anodynes, which with sedatives, hypnotics, or soporifics, are included in the group of narcotics, are medicinal agents capable of alleviating pain by lessening the sensibility of the nerve-centres or the peripheral extremities. When applied locally they are called analgesics. Included in this class are opium, morphia, chloroform, sulphuric ether, aconite, croton, chloral, belladonna, camphor, gelsemium, cannabis indica, stramonium, hyoscyamus, carbolic acid, atropine, creasote, cocaine, eugenol, iodoform, iodol, antipyrin, blood-letting, heat and cold, acupuncture, etc., etc.

Antemetics

Antemetics are medicinal agents capable of arresting vomiting. Included in this class are creasote, dilute hydrocyanic acid, lime water, chloral, chloroform, magnesia, dilute nitric acid, dilute phosphoric acid, belladonna, oxalate of cerium, etc.

Anthridrotics

Anthridrotics are medicinal agents capable of checking perspiration. Included in this class are oxide of zinc, sulphuric acid, acetic acid, tannic acid, sulphate of iron, hematoxylon, etc.

Antiperiodics

Antiperiodics are medicinal agents capable of relieving periodical diseases, such as intermittent fevers, neuralgia, etc. Included in this class are cinchona, quinia, arsenic (in form of Fowler's solution), chloroform, chloride of soda, salicin, etc.

Antipyretics

Antipyretics are medicinal agents having a decided power to depress the temperature of the body during fever, and control hyperpyrexia. Included in this class are antifebrin, antipyrin, quinoline or chinoline, thalline, kairine, camphor, eucalyptol, hydroquinon, pyrodin, resorcin, quinine, salicine, thymol, salol, etc.