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| | Stability Testing of Existing Drug Substances and Products |
 | | Stability studies should include testing of those attributes of the drug substance that are susceptible to change during storage and are likely to influence quality, safety, and/or efficacy. |
 | | The purpose of the stability study is to establish, based on testing a minimum of batches of the drug substance and evaluating the stability information (including, as appropriate, results of the physical, chemical, biological, and microbiological tests), a retest period applicable to all future batches of the drug substance manufactured under similar circumstances. |
 | | Stability testing of the drug product after constitution or dilution, if applicable, should be conducted to provide information for the labelling on the preparation, storage condition, and in-use period of the constituted or diluted product. |
| www.hc-sc.gc.ca /dhp-mps/prodpharma/applic-demande/guide-ld/chem/stabt_stabe_e.html (9200 words) |
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