The US Food and Drug Administration is advising drug manufacturers to assess the nitrosamine impurity risks associated with all chemically synthesized active pharmaceutical ingredients and all approved or marketed drug products that contain those APIs before March 2021.
They should follow up with confirmatory testing and submission of any required changes in their drug applications, starting immediately for high-risk drug products and finishing by September 2023, the agency recommends in a guidance published on 1 September. However, it isn't clear from