This section is from the book "A Text-Book Of Pharmacology, Therapeutics And Materia Medica", by T. Lauder Brunton. Also available from Amazon: A text-book of pharmacology, therapeutics and materia medica.
A mixture (commonly misnamed sulphide of calcium) consisting chiefly of sulphide of calcium [CaS; 72] and sulphate of calcium [CaS04; 136], in varying proportions, but containing not less than 50 per cent. of absolute sulphide of calcium, B.P. (36 per cent. U.S.P.).
Preparation. - B.P. By calcining sulphate of calcium (7) with wood charcoal (1) when part of the sulphate is reduced to sulphide.
Dose. - 1/10-1 gr.
Action. - In large doses it is an irritant to the stomach, but medicinal doses usually cause no trouble, or at most slight discomfort, sometimes giving rise to eructations of sulphuretted hydrogen, and perhaps to some looseness of the bowels.
Uses. - It is used chiefly for its effect on the process of suppuration, hastening the discharge of pus if already formed, and checking its formation if the inflammation be still in its early stage.
Sulphite of calcium in doses of 1/10-1 gr. four or five times daily is said to do good in acne.