Cantharis

(kan'-thar-is). Spanish Fly. The dried body of a species of beetle, C. vesica to ria (nat. ord. Coleoplerd). It contains a powerful poisonous principle, cantharidin, Locally applied, cantharis is a rubefacient and vesicant; internally it is an irritant, causing gastralgia and vomiting. In toxic doses it produces severe gastro-enteritis, strangury, and priapism. It is used chiefly as an external counter-irritant in the form of "blisters." C, acetum (B. P.), of the strength of to Oj. C, Ceratum, cantharides 32, yellow wax 18, resin 18, lard 22, oil of turpentine 15. C, Ext., Ceratum, cantharides 30, resin 15, yellow wax 35, lard 35, alcohol q. s. C, Charta, cantharides 1, Canada turpentine I, olive-oil 4, spermaceti 3, white wax 8, water 10 parts. Charta epispastic a (B P.), blistering paper (white wax, spermaceti, olive-oil, resin, Canada balsam, cantharides, distilled water). Collodium canthari datum, cantharides 60, flexible collodion 85, chloroform q. s. C. cum pic is emplast., Warm' ing Plaster, Burgundy pitch 92, cerat. canthar. 8 parts. Emplastrum calefaciens (B. P.), cantharides, expre ed oil of nutmeg, yellow wax, resin, resin-plaster, soap-plaster, boiling water. C, emplastrum (B. P.), cantharides, yellow wax, prepared suet, prepared lard, resin. C, liniment., cantharides 15, oil of turpentine q. s. ad 100. C. Tinct., contains 5 per cent, of the drug. Dose C, unguent. (B. P.), cantharides, yellow wax, olive oil.