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.
Sulphur frictions for rheumatism have been already mentioned, and the drug was formerly considered a good internal remedy for chronic muscular and articular pain, and no doubt it is often of real value when given in doses of from 5 to 20 gr. twice daily for some time - I think the smaller doses give the better results. Remedies calculated to produce diaphoresis, such as vapor-baths, should be generally combined with its use. In acute articular rheumatism it has little or no power.
Ferrum is useful in primary chronic rheumatism, also in cases when the patient is much reduced in strength and flesh after an acute attack; it should be continued for some time, for its favorable effects are but slowly produced.