The immediate treatment of poisoning does not vary greatly with drugs of the same class, therefore the drugs which most frequently cause poisoning are arranged alphabetically in classes.

Class I

Irritants and Corrosives.

Ammonia (Ammonium Hydrate)

Arsenic

Chromium Trioxide (Chromic Acid)

Hydrochloric Acid

Lead Acetate

Mercuric Chloride (Corrosive Sublimate)

Nitric Acid

Oxalic Acid

Phosphorus

Potassium Bichromate

Potassium Hydrate

Sodium Hydrate

Sulphuric Acid

Class II

Nervous Stimulants.

Aromatic Oils

Atropine (Belladonna)

Camphor

Cocaine

Hyoscyamus

Stramonium

Strychnine (Nux Vomica)

Turpentine

Class III

Cardiac Depressants.

Acetanilide

Aconite

Antipyrine

Cyanides

Digitalis

Gelsemium

Nicotine (Tobacco)

Phenacetine

Phenol (Carbolic Acid)

Physostigmine (Eserine)

Sulphonal

Trional

Veratrum

Class IV

Narcotics.

Alcohol

Bromides

Carbon Monoxide (Coal-Gas)

Chloral (Chloral Hydrate)

Methyl Alcohol (Wood Alcohol)

Opium