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.
The carbonate of potash was at one time in good repute in the treatment of whooping-cough, but we cannot expect more from it than the thinning of tracheal and bronchial secretion, and a slight sedative effect on the mucous membrane. The acetate has been especially recommended (Practitioner, vol. ii.), also the sulphuret; the latter is given in doses of 1 gr. per year up to four years, after that age in the proportion of 1/2 gr. per year. It is important that its solution should be freshly prepared: it is rather nauseous, and acts sometimes as an emetic, but if continued for four or five days will usually do good (Ranking, i., 1869, p. 65).