As directed by the U. S. Pharmacopoeia, this is made by dissolving half a troyounce of iodine and a troyounce of iodide of potassium in a pint of alcohol.

This preparation is, at least theoretically, better adapted for internal use than the preceding, upon two grounds; first, that, in consequence of the iodide of potassium it contains, it is not liable to precipitation on the addition of water; and secondly, that, for the same reason, it acts more promptly on the system, through its greater facility of absorption. it is also preferable to the simple tincture for local use, when the intention is that the iodine should be absorbed; and it may, therefore, be employed, more or less diluted with water, in the way of embrocation, or by means of compresses of linen saturated with it. For the more powerful local effect of iodine on the surface, it is less suited than the simple tincture, as it contains much less free iodine.

The dose is from fifteen to thirty drops, which may be increased, if thought desirable, until some evidence of its action is presented. it may be given in sweetened water.

Under the name of Liniment of iodine (Linimentum Iodi. Br.), the British Pharmacopoeia directs a very strong tincture, made by dissolving an ounce and a quarter (avoirdupois) of iodine and half an ounce (avoird.) of iodide of potassium in five fluidounces of rectified spirit. As its name implies, it is intended exclusively for external use.