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A new design for a chronological release profile of etodolac from coated bilayer tablets: In-vitro and in-vivo assessment.
Journal of Advanced Research 2019 January
Repeated dose medication usually maximizes adverse effects, while sustained release systems did not offer a fast onset of action. Etodolac was formulated to enable pulsatile and sustained drug release, which was chronologically more suitable as an anti-inflammatory drug. Eudragit® RSPO, Eudragit® RLPO, and HPMC K15M were added in the sustained release layer and tried in different ratios. Croscarmellose sodium or sodium starch glycolate were used as superdisintegrants for the fast release layer offering the loading dose for rapid onset of drug action. Bilayer tablets were successively coated with Opadry®II, HPMC K4M and E5 (1:40), and Surelease®. All formulations complied with the Pharmacopeial standards for post-compression parameters. In-vitro release profile illustrated a lag-time of 4 h followed by a rapid loading dose release for 2 h. A prolonged steady state release with a t1/2 of 11 h lastly occurred. The coated bilayer tablet showed pulsatile and sustained release effects in rats. The licking time and swelling degree were tested and results demonstrated significant difference ( P < 0.05) between the sustained anti-inflammatory action of formulation C1 compared to other groups. Therefore the new chronological design could provide a consistent drug release over 24 h with good protection against associated symptoms of gastric release.
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