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Three simple, rapid and accurate titrimetric procedures using potassium dichromate as titrant are described for the determination of six phenothiazine drugs in a pure form and in dosage forms. The procedures are based on the oxidation of phenothiazines in an acid medium to colorless sulfoxides via orange-or purple-colored intermediates. In the first method, phenothiazines are titrated directly in a H2SO4 medium to a colorless end-point. In the second procedure, a known excess of oxidant isdoi:10.2116/analsci.15.67 fatcat:2bbqyxdeg5h3ffg2bnlw3i2vnu