This section is from the book "Materia Medica And Therapeutics Inorganic Substances", by Charles D. F. Phillips. Also available from Amazon: Materia medica and therapeutics.
In these conditions, which are clearly dependent more or less upon fermentations or the presence of low organisms, the influence of sulphurous acid and its compounds ought, a priori, to be clearly shown, and so practically we find it, for sulphurous acid in 1/2-dr. doses is one of the best remedies that can be given. Sir William Jenner was one of the first to point this out (Medical Times, ii., 1853), and Dr. Henry Lawson, one of the first to secure for it the attention of the profession (Practitioner, vol. i.). C. Drysdale also early recorded a case rapidly relieved by this treatment after failure of bismuth, prussic acid, etc. (Lancet, ii., 1869). Other physicians have succeeded with the hyposulphites (Medical Times, i., 1853), and even with sulphites, and if Dr. Lawson found no benefit from these, as compared with the acid itself, it was probably because his dose was but small: the hyposulphites, however, must deposit sulphur, and as a rule, the acid will be found best.
Acidum sulphurosum: dose, 1/2 to 1 fl. dr., diluted. For external application the solution may be used in full strength, or diluted with equal parts of glycerin and water, or as a lotion 1 part in 8. Sodoe sulphis: dose, 20 to 60 gr., freely diluted: as a lotion (antiparasitic), 1 part in 8: as an injection, etc., 2dr. to 1/2 oz. in 8 oz. of fluid. Sodae hyposulphis: dose, 20 to 60 gr. Calcis sulphis: dose, 10 to 20 gr. Magnesioe sulphis: dose, 10 to 30 gr. Potassoe sulphis: dose, 10 to 30 gr.
[All the foregoing, except Calcis sulphis and Magnesioe sulphis, are officinal in the U. S. Pharmacopoeia.]