Two nitroheterocyclic drugs, nifurtimox (NFX) and benznidazole (BZ), used in the treatment of Chagas' disease have serious side effects attributed to their nitroreduction to reactive metabolites. Here, we report that these drugs reach the mammary tissue and there they could undergo in situ bioactivation. Both were detected in mammary tissue from female Sprague-Dawley rats after their intragastric administration.
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