Benzoic Sulphide of Sodium is obtained by dissolving a large quantity of benzoic acid in a concentrated solution of sulphide of sodium. It is a valuable antiseptic for dressing wounds, and may be used as a wash, lotion or injection, its antiseptic properties being very active and healing. Thirty to forty-five grains are used to the quart of water. Heckel considers it to be equal to carbolic acid, and superior both to sublimate and iodoform, as it is not poisonous like corrosive sublimate, and is free from the disagreeable effects of iodoform. It is very soluble in water and contains the antiseptic properties of its two principal ingredients - benzoic acid and sulphite of sodium. It is harmless, even when given in large doses.