This section is from the book "A Treatise On Therapeutics, And Pharmacology Or Materia Medica Vol1", by George B. Wood. Also available from Amazon: Part 1 and Part 2.
This may be made by double decomposition between valerianate of soda and sulphate of zinc, dissolved separately in boiling water, and then mixed. Upon evaporation, the valerianate of zinc is formed, being less soluble than either of the other salts, and is separated in the shape of crystals, which float on the surface, and are removed as they appear. The salt is in white, pearly, scale-like crystals, which have a feeble odour of valerianic acid, and a styptic, metallic taste. It is of difficult solubility, requiring 160 parts of cold water, and 60 of alcohol.
Its effects on the system ere essentially the same as those of the sulphate, though less astringent. It was introduced into use under the impression that valerianic acid might impart to it greater antispasmodic efficiency than belongs to the preparations of zinc generally. It has proved useful in various nervous diseases, such as those for which the other preparations of zinc are employed; hut experience has not satisfactorily shown that it has any superiority over them. The dose is one or two grains, several times a day. It is usually administered in the pilular form.*