Analysis of certain phenothiazines and their dosage forms by photometric titration with ceric sulfate.

A photometric titration procedure is described for the determination of a number of phenothiazine derivatives and their dosage forms. An acidic solution of the drug or dosage form is titrated with standard ceric sulfate solution. The end point is determined photometrically at 420 mG. Quantitative recoveries are reported for 14 phenothiazine derivatives and three dosage forms.