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.
Chloral Hydratum. Hypnotic, antispasmodic, and analgesic. Employed in insomnia, spasmodic, and painful affections. Contraindicated in gastritis, heart affections, and the extremes of life. Adult dose, 5 to 20 gr. Tetanus requires large doses, as does every indication to cause muscular relaxation. Sleeplessness from mental exaltation requires full doses, while that due to exhaustion rather small doses. In delirium tremens small doses, repeated as necessary, give best results. In very small doses (1-10 to I gr.) it is employed in hives ofttimes with success. The homeopaths recommend minute doses for urticaria and a coldness of the body surface.