Synchronized and controlled release of metformin hydrochloride/glipizide from elementary osmotic delivery

Hao Pan, Hengpan Jing, Xinggang Yang, Weisan Pan, Tianbao Chen

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8 Citations (Scopus)
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The combination of metformin hydrochloride (MTF) and glipizide (GLZ) is second-line medication for diabetes mellitus type 2 (DMT2). In the present study, elementary osmotic pump(EOP)tablet is designed to deliver the combination of MTF and GLZ in a sustained and synchronized manner. By analyzing different variables of the formulation, sodium hydrogen carbonate is introduced as pH modifier to improve the release of GLZ, while ethyl cellulose acts as release retardant to reduce the burst release phase of MTF. A two factor, three level face-centered central composite design (FCCD) is applied to investigate the impact of different factors on drug release profile. Compared with conventional tablets, the elementary osmotic pump (EOP) tablet demonstrates a controlled release behavior with relative bioavailability of 99.2% for MTF and 99.3% for GLZ. Data also shows EOP tablet is able to release MTF and GLZ in a synchronized and sustained manner both in vitro and in vivo
Original languageEnglish
JournalDrug Development and Industrial Pharmacy
Early online date09 Jun 2016
Publication statusEarly online date - 09 Jun 2016


  • Synchronized and sustained release; elementary osmotic pump (EOP); face-centered central composite design; metformin hydrochloride/glipizide


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