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The H2 blocker ranitidine (Zantac) has been withdrawn from the U.S. market because of concerns over levels of the contaminant N-nitrosodimethylamine, which can increase with time and temperature, posing a risk of cancer. Patients should be told to discard all products containing ranitidine.
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Diane S. Aschenbrenner (2020) studied this question.
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