Extractum Gentianae (U. S. P.)—Extract of Gentian.
Preparation.—"Gentian, in No. 20 powder, one thousand grammes (1000 Gm.) [2 lbs. av., 3 ozs., 120 grs.]; water, a sufficient quantity. Moisten the powder with four hundred cubic centimeters (400 Cc.) [13 fl℥, 252♏] of water, and let it macerate for 24 hours; then pack it in a conical percolator, and gradually pour water upon it until the infusion passes but slightly imbued with the properties of the gentian. Reduce the liquid to three-fourths of its bulk by boiling, and strain; then, by means of a water-bath, evaporate to a pilular consistence"—(U. S. P.).
Description, Medical Uses, and Dosage.—Extract of gentian is a tenacious, shining, dark-brown or blackish product, very bitter to taste, but pleasant in odor. The principles are extracted by cold water, while the starch and pectin remain in the powder. By subsequent boiling the albuminous matter is separated. This extract is a tonic, and may be used wherever this indication is present, either alone or in conjunction with other tonics. The dose is from 1 to 10 grains.