The draft Circular amends entries 4.1, 4.3 and 5.2 of Appendix I to Circular No. 27/2026/TT-BNNMT, and adds entry 2 to Appendix II. It updates the classification and quality-management requirements for pharmaceutical veterinary drugs, veterinary vaccines and aquatic feed subject to medium risk, and for veterinary drugs containing narcotic substances and live attenuated veterinary vaccines subject to high risk. It specifies the applicable national technical regulations, testing and conformity-assessment routes, and conformity-declaration requirements, including methods for domestic and imported aquatic feed.