Diclofenac sodium (DS) a non-steroidal anti-inflammatory drug has a bitter taste and is a local stomach irritant. The aim of this study was to formulate taste masked DS orally dispersible tablets (ODTs) with targeted drug release in the intestine. Pellets of DS were designed using sugar sphere cores layered with DS followed by an enteric coat of Eudragit L100 and a second coat of Eudragit E100 for taste masking. The produced pellets had a high loading efficiency of 99.52% with diameters ranging from 493.7 to 638.9 µm. The prepared pellets were spherical with smooth surfaces on scanning electron microscopy examination. Pellets with the 12% enteric coat Eudragit L100 followed by 5% Eudragit E 100 resulted in 1.4 ± 0.5% DS release in simulated gastric fluid (SGF) and complete dissolution in simulated intestinal fluid (SIF). The pellets were then used to formulate ODTs. In vitro disintegration time of ODTs ranged from 20 ± 0.26 to 46 ± 0.27 s in simulated saliva fluid (SSF). Dissolution was less than 10% in SGF while complete drug release occurred in SIF. The release rate was higher for the optimized formulation (F12) in SIF than for the marketed product Voltaren® 25 mg tablets. The optimized ODTs formulation had a palatable highly acceptable taste.
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