Open Access The goal of this study was to design and evaluate extended-release system of the hypnotic agent, Zolpidem tartrate usefulness for the treatment of insomnia. The half-life of this drug is about 1.9-3 hours that indicating it a candidate for the extended release formulation. Our investigation relates to development of extended drug delivery system based on Hydroxy propyl methyl cellulose (HPMCK4M) as release retardant, polyvinyl pyrrolidone (PVP k30) as binder and Magnesium Stearate

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... ing Factorial design. In vitro release study of matrix tablets was carried out in 0.01N HCl for 2 hours. All prepared matrix tablets were evaluated for physicochemical evaluation and drug content. The formulation that had release profile according to United State Pharmacopoeia selected for stability study according to ICH guidelines.