This product of the deadly nightshade (atropa belladonna) is a powerful narcotic or brain stimulant drug. The extract of the leaves is most used by physicians as a medicine, in neuralgia, etc. Atropia, a very strong alkaloid principle, is obtained from the root. Its solution is often dropped into the eyes by oculists, for the examination and treatment of affections of the eyes. It enlarges or dilates the pupils, giving them a more brilliant appearance. Ladies are said to take it sometimes before going into company, to make their eyes "brighter;" whence the name, from bella donna, fair lady.

Dose of the solid extract, a quarter of a grain to a grain; of the tincture, ten to fifteen drops. Solution of atropia for the eyes, two to four grains to a fluidounce of water. Neither should be used without medical advice.