Formulation and Evaluation of Diclofenac Sodium Dual Type Mini Tablets for Extended Action

In order to achieve rapid action and sustained release, we have fabricated dual type of mini-tablets of Diclofenac Sodium enclosed in a single capsule. 10 formulations of rapid release (IF1-10) mini tablets were prepared using sodium starch glycolate, Cross povidone and Micro crystalline cellulose. 12 formulations of sustained release (SF1-12) mini tablets were prepared by using HPMC, carbopol, Ethyl cellulose, xanthan gum and guar gum. All formulations were evaluated for pre-compression and post-compression parameters. Drug Excipient interaction was determined by FTIR, Short term stability studies were carried out at 40 0C /75 % RH for 3 months. Pre-formulation and studies conformed that all formulations showed better flow property. In vitro studies showed that all mini tablets in combination released more than 55 % within 30 min whereas marketed tablet Voveran SR 100 showed only 11 % release indicating the rapid drug release and the release was extended up to 80 % in 20th hour indicating the sustainability of the release. Natural polymers, Xanthan gum and guar gum containing formulations showed above 90 % in 12th hour indicating little rapid drug release when compared to synthetic polymers. FTIR report indicated no interaction of drug with excipients. Stability studies showed no significant loss in drug content, release profile and physical appearance. Hence it can be concluded that, the release profiles duel type mini tablets were quite promising for once a day formulation.