This section is from the book "A Practitioner's Handbook Of Materia Medica And Therapeutics", by Thos. S. Blair. Also available from Amazon: A Practitioner's handbook of Materia Medica and Therapeutics.
Asclepias Tuberosa, Pleurisy Root. This is an eliminative agent acting upon the sudoriparous glands. It is mildly antispasmodic and carminative. It is a feeble but useful remedy. In large doses (f,e. or ec. tr., 15 to 60 I.) it is quite effective in acute pleuritis and in tight and painful coughs and in acute rheumatism, but should be combined with other remedies indicated and not depended upon alone except in passing ailments. In moderate doses (f.e. or ec. tr., 5 to 10 I.) this drug meets its real field of utility, and especially so in the diseases of children. It is a remedy that never depresses, and its carminative properties especially adapt it to children of tender age. With them it is distinctly expectorant, and increases secretion from the serous membranes first, then from the mucous membranes, and lastly from the skin. Minute doses of aconite facilitate its action. Instead of giving Dover's powder to children, give asclepias, ipecac, and camphor in combination and the results will be better. Personal impressions from my own experience lead me to believe that the opium in Dover's powder quite overshadows the action of the ipecac when administered to the babies. Asclepias is too feeble in action to be depended upon in small doses.