What is CANTHARIDES or SPANISH FLIES?

Coleopterous insects used in medicine for vesicating purposes in the form of tinctures and plasters, also for com pounding hair tonics. The active principle is a poisonous crystalline substance named Caitthairidin which is prepared from these insects or from Mytabrls cicltorii by digestion with ether or alcohol, or a mixture of these two solvents.

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Definition of  CANTHARIDES or SPANISH FLIES