Hydracetin. Acetphenylhydrazin.

A new antipyretic, the active ingredient of which is Acetylphenylhy-drazine, or C6 H5 .NH2 .C2 H30.

It is an aniline product, akin to "Antithermim," and is a colourless crystalline powder, not very soluble in cold water.

Therapeutics. It is a powerful reducer of fever temperature, which it effects quickly and permanently, producing great perspiration. But its action is so strongly marked, that only one dose should be given in twelve hours; indeed, 2 grains for a child, and 5 grains for an adult ought not to be at first exceeded; its use requires great caution from its toxic effects in the blood. It is used in powder or tablets, and has been used in pneumonia, typhus and scarlet fever.