Camphor is a concrete volatile oil obtained by sublimation from the twigs of the camphor tree, which grows in the Dutch Indies, China, and Japan. It is a valuable drug in veterinary practice, and is given internally as well as applied to the skin in various ways. Its chief preparations are spirit of camphor and the compound tincture (better known as paregoric elixir), camphor liniment (camphorated oil), and camphor water.
Externally applied, camphor acts as a stimulant to the skin, and is employed as a liniment, in combination with oil, ammonia, soap, and other ingredients, for relieving sprains and stiffness of muscles and joints.
It is also a heart stimulant, and is given in febrile diseases, more particularly to overcome nervous prostration following upon attacks of delirium. Laro-e doses cause excitement and convulsive movements of the muscles.