Phenothiazine toxicity

Abstract

Extract Farmers and stock firms have suggested that “fine particle” phenothiazine is toxic, despite work (Whitten, 1956 Whitten, L. K. 1956. N.Z.vet. J., 4: 63–63. [Taylor & Francis Online] [Google Scholar] ) which has shown that phenothiazine of 10-micron particle size is a more efficient parasiticide than coarser material. The writer was fortunate in obtaining phenothiazine of a known particle size, and attempted to determine toxicity with doses of 15 gm., 75 gm., and 120 gm., using the samples provided.