Even though Zhejiang Huahai Pharmaceuticals Co. Ltd., Linhai, China, may have been following “current industry practice,” its failure to anticipate that a manufacturing process change would introduce a carcinogenic impurity into its valsartan active pharmaceutical ingredient in 2012 was inconsistent with current good manufacturing practices, FDA told the firm in a warning letter it posted Dec. 11.
In response to FDA’s Aug. 3 inspection report, the firm on Aug. 26 implored the agency to consider that the...







