TLC differentiation of butyrophenone and diphenylbutylpiperidine compounds from phenothiazine derivatives.

A procedure is described for TLC detection and differentiation of the butyrophenone-diphenylbutylpiperidine group and phenothiazine derivatives at the microgram level. A two-dimensional TLC method to separate butyrophenone and diphenylbutylpiperidine compounds is reported. A variety of possible detection reagents were examined. The solvent systems and spray reagents described should be useful for the identification of these drugs in various dosage forms.