New toxic drug impurities detected in some heart pills in US

The impurities were found in blood pressure drugs which have been recalled in Canada as well as Europe earlier this year. U.S. officials helped lead the way in the 2018 recalls of the same type of drugs tainted with the probable carcinogen N-Nitrosodimethylamine, or NDMA, though they have yet to pull any for containing the azido impurities.