The previous reported finding of elevated PBI in patients receiving perphenazine has been once more confirmed. A marked difference in the finding between pre- and post-1962 has been found. Trace amounts of iodine in perphenazine have been demonstrated and this finding has been discussed. The persistance of this finding up to several years after the initial ingestion of perphenazine has been noted. A tentative hypothesis to explain this phenomenon is given.
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