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.
I have seen relief given to the dyspnoea dependent on these conditions by small doses of sulphate of copper continued for some time. I believe it acts partly through the nervous system, and partly like other astringents, by lessening the amount of secretion in the bronchi, and so permitting free access of air.
 
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