![]() ![]() Pfizer first announced that it was planning a recall of the drug on June 24 after discovering the likely carcinogen. The source of the chemicals in medication could come from its manufacturing process, its chemical structure or even the conditions under which they are stored and packaged. Pfizer didn't indicate how the nitrosamines got in Chantix. In 2019, Sanofi SA recalled its heartburn drug Zantac for having high amounts of the carcinogenic ingredient. Last year, the FDA found high levels of nitrosamines in the popular diabetes drug, metformin, Bloomberg reported. Pfizer paused distribution Chantix back in July after finding elevated levels of nitrosamines in the pills and announced it was recalling 12 lots of the anti-smoking drug
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