Aqua Gentianæ compositæ
College. Take of Gentian roots sliced, one pound and a half, the leaves and flowers of Centaury the less, of each four ounces, steep them eight days in twelve pounds of white Wine, then distil them in an alembick.
Culpeper. It conduces to preservation from ill air, and pestilential fevers: it opens obstructions of the liver, and helps such as they say are liver-grown; it eases pains in the stomach, helps digestion, and eases such as have pains in their bones by ill lodging abroad in the cold, it provokes appetite, and is exceeding good for the yellow jaundice, as also for prickings or stitches in the sides: it provokes the menses, and expels both birth and placenta: it is naught for pregnant women. If there be no fever, you may take a spoonful by itself; if there be, you may, if you please, mix it with some cooler medicine appropriated to the same use you would give it for.
Source: The Complete Herbal and English Physician Enlarged, Nicholas Culpeper