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Helbing'sPharmacological Record for May has an important statement concerning the undue proportions of potassium chlorate that are found in the bromides of American makers. An examination made by Helbing and Passmore show that it is a serious matter to buy the potash salt, at the present time, without having it carefully analyzed as to the percentage of chlorides it may contain. The English drugs in their original packages, however, are pronounced as safe. Samples of those products did not yield higher than .13 per cent, of chlorate of potash, while four American samples carried from 4.52 to 5.96 per cent. The American Pharmacopœia permits of not more than three per cent., and the German about one per cent. The importance of purity in a drug of this nature is very great, and will receive the earnest heed of neurologists everywhere.
IMPURE AMERICAN BROMIDES. JAMA. 1892;XIX(9):263–264. doi:10.1001/jama.1892.02420090025010
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