Emplastrum Belladonna Compositum.—Compound Plaster of Belladonna.
Preparation.—Take of resin plaster (contains lead), 5 troy ounces; alcoholic extract of belladonna root, 1 troy ounce; alcoholic extract of conium maculatum, 1 ½ troy ounces; pulverized iodine, 40 grains. Place the plaster in an earthenware mortar, and put this in hot water. When the plaster commences to melt, add the extracts of belladonna and conium, and rub the ingredients well together; then take the mortar from the water-bath, continuing the trituration, and, when nearly cool, add the iodine. The inspissated juices of the above narcotics are preferable to the ordinary extract in preparing this plaster.
Action and Medical Uses.—This plaster may be used for the same purposes as the belladonna plaster, and is also an excellent application over scrofulous and other tumors, white-swelling, and goitre; and may likewise be applied over the region of the liver and spleen for chronic affections of these organs, and over the lumbar vertebrae in severe dysmenorrhoea. Like the preceding plaster, it occasionally affects the constitution, and then requires to be omitted for a few days (J. King).