This section is from the book "Botanic Drugs Their Materia Medica, Pharmacology and Therapeutics", by Thomas S. Blair. Also available from Amazon: Botanic Drugs, Their Materia Medica, Pharmacology and Therapeutics.
Scammony, a gum resin from Convolvulus Scam-monium. Official in the U. S. and a few other countries. Both scammony and jalap yield complex mixtures of resins which have not been definitely defined.
Scammony is a rapid and energetic hydrogogue cathartic, irritant in over-doses; it stimulates the liver and the intestinal glands. This drug is seldom used alone, but it is an ingredient in several purgative formulae. In proper combination it is adapted to the treatment of obstinate constipation. Its use in dropsy and as an anthelmintic is hardly to be advised in view of the fact that we have better and less irritating agents. The average dose is 4 grains, the resin 3 grains.