This is a house-yard shrub bearing bright red berries which are often used for preserving purposes. The bark is the portion that is used medicinally.

Barberry bark is an intensely bitter stimulant, used chiefly for torpid condition of the liver and flaccid conditions of the stomach. It is a pronounced tonic and is adapted only to chronic cases. In jaundice, accompanied by loss of strength and feeble appetite, it is valuable. It is much used in malarial diseases combined with other agents. An infusion of half an ounce to the pint of boiling water is sufficiently strong. Half a teacupful before meals will prove of much benefit. It is used as part of the bitters No. 4. The dose of the Tincture is from 5 to 10 drops.