US FDA Questions Valisure’s Zantac Carcinogenicity Findings

As ranitidine suspensions and recalls mount worldwide, US agency says heat of pharmacy lab's test made nitrosamine levels appear high.

formula
differences emerge over test methods

Amid a global rush to judgment among several regulatory authorities, pharmaceutical companies, chain drugstores and trial lawyers on the potential carcinogenicity of ranitidine, the US Food and Drug Administration remains a conspicuous holdout.

Now the agency is questioning the third-party test results obtained by an online pharmacy, Valisure LLC, that set the recalls...

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