Abstract
This article previously published in Volume 22 Issue 6 of this journal in June 2023 has been retracted in line with the guidelines from the Committee on Publication Ethics (COPE, http://publicationethics.org /resources /guidelines). This was a follow up to the report by somebody identified as VU Nguyen (email: nguyenvu81@protonmail.com) of the duplicate publication of an article earlier published in 2020 (available at http://125.212.201.8:6008 / ViewOnline?bitstid=0d585588-2d02-4839-907a-92998674bb4d & type=1) in Vietnamese where a figure and some text in the article were repeated in the article published in this journal.
 This action was taken after thorough investigation of the plagiarism report and follow-up comments from both the corresponding author and Nguyen VU against the guidelines of the Committee on Publication Ethics (COPE).
 Retraction: Ho HN, Nguyen VA, Ho NA, Le HH. Development of a hydrogel containing metronidazole-loaded Eudragit RS 100 nanoparticles for buccal drug delivery. Trop J Pharm Res 2023; 22(6):1147- 1154 doi: 10.4314/tjpr.v22i6.1.
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