Not officinal. - Isomeric with oil of turpentine, and prepared from it by oxidation with sulphuric acid.

Characters. - A colourless liquid, with the odour of pine wood, and a hot taste. •

Solubility. - Insoluble in water; soluble in alcohol.

Dose. - 10 to 20 minims.

Administration. - It may be given internally in sugar, or as an inhalation like the vapor olei pini sylvestris, B.P.; 40 minims suspended in one ounce of water by the aid of 20 grains of light carbonate of magnesium; one drachm to be inhaled in one pint of hot water. It is sometimes inhaled on a respirator (10-30 min.).

Action. - Terebene acts like oil of turpentine (q.v. p. 1059), as a stimulant to the bronchial mucous membrane. It is, however, more agreeable to take, and is said not to have the same tendency to cause renal mischief. It is antiseptic and deodorant.

Uses. - Both internally and by inhalation, terebene has been extensively used for the dyspnoea of emphysema and chronic bronchitis, where there is no acute inflammation.

It is sometimes useful in flatulence due to fermentative changes in the stomach.

Sanitas. Not officinal. - A disinfecting solution obtained by acting on oxidised turpentine with water. Its active principle is peroxide of hydrogen (p. 540). Its advantages are that it is not poisonous and does not stain linen.