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.
Tolu Balsam, from Toluifera balsamum, is almost universally official. It is also called Myroxylon tolu iferum. The balsam contains a little benzoic acid; it is a very mild expectorant; but the syrup is a pleasant flavor and diluent for more active expectorant agents. Its average dose, given alone, is 4 fluidrachms; the tr. is given in doses of 30 minims, and the balsam 15 grains.