3. Emplastrum Cantharidis.-Cantharides Plaster. Abv.-Emp. Canthar. Cantharides Cerate spread upon Rosin Plaster. It should not be dispensed unless freshly prepared.

4. Tinctura Cantharidis.-Tincture of Cantharides. Abv.-Tr. Canthar. Cantharides 100; by percolation and maceration with Alcohol to 1000.

Dose, 0.1 mil (11⁄2 m).

For the Therapeutics of Cantharides see p. 493.