The Food and Drug Administration (FDA) issued a warning letter to the China-based manufacturer of the active pharmaceutical ingredient (API) in the heart medication valsartan that is under investigation by the agency after the presence of a probable cancer-causing impurity was found in the drugs. The FDA’s warning letter outlines several manufacturing violations at Zhejiang Huahai Pharmaceutical Co. Ltd (ZHP), in Linhai, Taizhou Zhejiang China, including impurity control, change control and cross contamination from one manufacturing process line to another. The FDA is still looking for the root cause of the impurity, which the agency said previously may have been ... Read More
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