=Emplastrum Cocainæ.= 1 dissolved in 50 of lead plaster heated in a water bath. Useful for intercostal neuralgia, sciatica, tender corns, bruises, &c. =Oleatum Cocainæ.= A saturated solution of the alkaloid in oleic acid; heated, one part will dissolve in two parts of oleic acid; it may be further diluted with oleic acid or oil. Has not proved so satisfactory a preparation as =Oleum cum Cocaina.= A 2 per cent. solution, more or less, if ordered, in almond oil, is mostly used. This is useful for earache. For the eye a 2 per cent. solution in castor oil is used; for catheters, a solution in equal parts castor and almond oils does well, it is viscid, and does not congeal in winter. =Suppositories= and =Pessaries of Cocaine= have ½ grain (or more, if ordered) in each with cacao-butter. =Tabellæ Cocainæ=, Cocaine Tablets. ¹⁄₂₀ grain in each, with chocolate (or more, if ordered). _Dose._—1 every quarter, half-hour, or hour, quickly eaten and swallowed. Useful for sea-sickness, chloroform or alcohol sickness, sickness of pregnancy, &c. =Unguentum Cocainæ.= 1 in 30 of lard or lanoline (more or less, if ordered). Cocaine is soluble 1 in 2 of anhydrous lanoline if gently warmed. Useful where absorption is required, as in facial neuralgia, shingles, eczema, erysipelas, urticaria, and pruritus. =Vaselinum Cocainæ.= 4 per cent. (more or less, if ordered). Suitable for the eye; is very bland; also for smearing catheters, burns, scalds, &c. =Cocainæ Citras=, Citrate of Cocaine. _Dose._—¹⁄₂₀ to 1 grain or more. Is in deliquescent small white crystals; used by dentists. =Cocainæ Hydrobromas=, Hydrobromate of Cocaine. _Dose._—¹⁄₂₀ to 1 grain, in a pill or solution. Is a stable salt, in odourless, small, white, hard, acicular crystals. =Cocainæ Hydrochloras=, Hydrochlorate of Cocaine (_Off._). _Off. Dose._—⅕ to 1 grain, but less and more may be given, in aqueous solution, pill, or pastil. This salt has been most used: if pure it is in hard, colourless, short, acicular, granular-looking crystals, or, now more frequently met with, in light, shining, lamellar crystals, free from odour and almost tasteless; being soluble in half its weight of water, the tingling numbness and local anæsthesia which it produces on the tongue are more intense than that produced by pure cocaine.