Tincture is concentrated cannabis that is taken by mouth using a dropper. The cannabis in tincture is typically infused into an oil or alcohol. Directions say to take one to ten drops under your tongue, hold it there for several minutes, and then swallow. This is called taking it sublingually. You can also add drops of tincture to food or beverages. In chemistry, a tincture is a solution that has ethanol as its solvent.