Tincture of iodine, iodine tincture, or weak iodine solution is an antiseptic. Myrrh and borax in tincture can be used as a mouthwash. Opium tincture is useful as an analgesic and antidiarrheal. A tincture using glycerine is called a glycerite. Gee's Linctus is a cough medicine which contains opium tincture. Applications of tincture of iodine or Betadine can cause rashes, sometimes severe. Extreme caution is advised when administering doses of Tincture of Opium. The aroma of the tincture gives a pleasant odor only after it is considerably diluted. Internally, it is used for coughs and bronchitis, as a tea, tincture, or syrup. Less commonly, some may ingest salvia in the form of a tincture. Thus, an order for opium tincture containing directions in teaspoons is almost certainly in error. The pharmacological effects of opium tincture are due principally to its morphine content. This represents the equivalent of between two to three teaspoons () of opium tincture. The indigenous peoples of Peru made a tincture of cinchona to control fever. Life-threatening overdose of opium tincture owes to the preparation's morphine content.