1. A method for the determination of urinary chlorpromazine and its metabolites employing adsorption on Dowex 50 W-X4 cation exchange resin is described.2. Polar, intermediary oxidative and conjugated metabolites constitute by far the largest drug fraction, amounting to approximately 80% of total urinary drug.3. One half of administered daily drug doses was found to be excreted in the urine.4. Recoveries by this method range from 88% to 97%.Abstract Teaser