Plaster of O′′pium. Syn. Emplastrum anodynum, E. opii (B. P., Ph. L. E. & D.), L. Prep. 1. (Ph. L.) Lead plaster, 8 oz.; melt, and add of frankincense (thus), 2 oz.; next, add of extract of opium, 1 oz., previously dissolved in boiling water, 1 fl. oz.; and, constantly stirring, evaporate the mixture over a slow fire to a proper consistence. This plaster is much stronger than that of the Ph. L. 1836 and of the other British Colleges.
2. (Ph. L. 1836.) Lead plaster, 1 lb.; melt, add of powdered thus, 3 oz.; mix, and further add, of powdered opium, 1⁄2 oz., water, 8 fl. oz., and boil to a proper consistence.
3. (Ph. E.) Litharge plaster, 12 oz.; Burgundy pitch, 3 oz.; liquefy by heat, then add, by degrees, of powdered opium, 1⁄2 oz., and mix them thoroughly. This and the preceding contains only 1-3rd part of the opium ordered in the present Ph. L. & D.
4. (Ph. D.) Resin plaster, 9 oz.; opium, in fine powder, 1 oz.; as the last. Same as B. P.
5. (Ph. B.), Powdered opium, 1 oz.; resin plaster, 9 oz.; melt the plaster and add the opium.
Obs. The above plaster is reputed anodyne, and useful in various local pains; but its virtues
in this way have been greatly exaggerated. The formula of the Ph. L. 1836, from being less costly, is still often employed in place of that of the Ph. L. 1851. The following is commonly used:—Lead plaster, 14 lbs.; yellow resin, 2 lbs.; powdered opium, 1⁄2 lb.
Plaster of Opium and Camphor. (Dr Paris.) Syn. Emplastrum opii et camphoræ. Prep. Opium and camphor, of each 1⁄2 dr. Lead plaster q. s. Mix.
Plaster of Ox′ide of I′ron. Syn. Iron plaster, Frankincense p., Strengthening p.; Emplastrum roborans, E. ferri (B. P., Ph. L. E. & D.), E. thuris, E. ferri oxydi rubri, L. Prep. 1. (Ph. L.) Lead plaster, 8 oz.; frankincense (thus), 2 oz.; melt them together over a slow fire, sprinkle into the mixture sesquioxide of iron, 1 oz., and mix the whole well together.
2. (Ph. E.) Litharge plaster, 3 oz.; yellow resin, 6 dr.; beeswax, 3 dr.; melt them together, then add of red oxide of iron, 1 oz., previously triturated with olive oil, 31⁄2 fl. dr.