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.
Broom, Cytisus scoparius. Official in England and in the U. S. P. VIII.
Sparteine, the alkaloidal principle, usually prescribed in the form of the sulphate in an average dose of 1-5 grain, belongs to the coniine group; its supposed influence upon the heart has been dis-proven, and it is being abandoned as a remedy.
Scoparin is the diuretic principle in scoparius; but its action is weak.
The infusion and decoction are definitely diuretic and they are to be preferred, though we have much more certain diuretics.
The dose of scoparius is 15 grains, of the fl. 1/4 to 1 fluidrachm.