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.
Convallaria, Lily of the Valley. An infusion of the whole plant is an active and satisfactory preparation. The root is more commonly employed, and should, preferably, be worked in a recent state. The solid extract is usually unsatisfactory. Convallaria increases blood pressure and the flow of urine, has no cumulative action, and is very slightly toxic. It is of use when the ventricles are over distended and dilatation begins in an absence of compensatory hypertrophy and in venous stasis. Its most effective range, according to Germain-See, is cardiac paresis, palpitation, arhythmia, mitral constriction and insufficiency, dilatations, and cardiac dropsy. It does not take the place of digitalis when an immediate and decided impression is demanded, but for long-continued administration it is superior, since it is not cumulative, does not interfere with digestion. and exerts its diuretic action gently except in very large doses. Dose, infusion. from I to 3 tablespoonfuls, the large dose only temporarily; U. S. P. f.e., 5 to 20 I; green root fluidextract or ec. tr., I to 5 I . Tinctures are too weak. The glucoside Convallamarin, 1-12 to I gr.