You are here Home Guidance and resources Resources International scientific guidelines adopted in Australia International scientific guideline: ICH topic Q3A (R2) - Note for guidance on impurities testing: Impurities in new drug substances CPMP/ICH/2737/99 adopted by the Therapeutic Goods Administration (TGA) Listen Print Share LinkedIn (Twitter) Facebook Email Loading... About this guideline Overseas effective date: 1 Jun 2014 Replaces: CPMP/ICH/2737/99. ICH Topic Q 3 A (R) (Adopted by TGA 12 March 2003) Categories: Quality | Impurities | Nonclinical | General (nonclinical) Access this international scientific guideline For more information see International scientific guidelines adopted in Australia. Where EU guidelines adopted in Australia include references to EU legislation (including EC Directives and Regulations), the requirements contained in the referenced EU legislation are not applicable to the evaluation of medicines by the TGA.