This section is from the book "A Practitioner's Handbook Of Materia Medica And Therapeutics", by Thos. S. Blair. Also available from Amazon: A Practitioner's handbook of Materia Medica and Therapeutics.
Conium, Poison Hemlock. In the absence of its characteristic odor this drug is of little value. Insist upon fresh preparations; keep well corked, and dilute only as used. The expressed juice of the plant, preserved with alcohol, is its best preparation, but is hard to get. An assayed fluidextract is reliable.
For the physiologic action in detail, read Plato's description of the death of Socrates or the text-books. It is of value in diseases characterized bv extreme activity of the motor nerves, such as paralysis agitans, chorea, hysteria, delirium tremens, laryngeal spasm, torticollis, some cases of asthma and whooping cough, and irritable laryngeal cough. It is highly useful in visceral pain and the pain of cancers, Dose, f.e., 2 to 6 I., but may be run up to 20 I. in cancer; ec. tr., I to 5 I. ; expressed juice, I to 5 I.. For hypodermic use, Merck's Coniine Hydrobromate, 1-20 to 1-6 gr. with caution and only in severe cases.