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.
Musk Root, Ferula species and F. sumbul. Official in the U. S. and Mexico. Galbanum (the gum resin) is also derived from Ferula species, more particularly F. galbanifiua and F. rubricalis. Asafetida, q. v., is derived from Ferula species, four of them being recognized.
Sumbul is an over-rated and poorly defined drug, having an action and uses similar to asafetida, q. v. As carminatives, both act similarly; as nervines, both are inferior to valerian. Sumbul is given in 30-grain doses; fl. 30 minims, and the extract 4 grains.