From Nux vomica, the poison nut tree. The homeopathic remedy is made from the dried, ripe seeds, which contain strychnine, a powerful poison which acts on the central nervous system; in small doses strychnine makes perceptions more vivid and increases production of saliva; in larger doses it causes tetany or muscular spasm, and death from respiratory failure.
Several physical types respond well to Nux vom., although self-reliance, efficiency and a liking for hard work tend to be common characteristics, which explains why many Nux vom. types are managers, supervisors, or entrepreneurs. Some Nux vom. types are well-groomed, hearty, and full of life, others slouch as if they have been up all night; many are thin, prematurely bald, suffer from indigestion and irascibility, and aspire to the finer things of life; complexion may be dry, lined and sallow, with rings under the eyes.