Properties : Sodium iodid occurs as colorless, cubic crystals, or as a white, crystalline powder, odorless and having a saline and slightly bitter taste. It is very soluble in water (1 :0.5) and freely soluble in alcohol (1 :3).

Incompatibilities: Sodium iodid is incompatible with spirit of nitrous ether, bismuth salts, ferric salts, and the salts of many alkaloids.

Action and Uses: Sodium iodid has properties closely resembling those of potassium iodid, and like sodium bromid is perhaps less irritating than the potassium salt.

Dosage: 0.5 gm. or 7 grains. For ordinary cases the dose may range from 0.3 to 1.25 gm. or from 5 to 20 grains. When employed for the energetic treatment of tertiary syphilis it is sometimes necessary to increase the dose to from 2 to 5 gm. or from 30 to 75 grains or more. It should not be given on an empty stomach but should be administered with some form of food, preferably liquid, such as milk.