Document Detail

pH-independent sustained release matrix tablet containing doxazosin mesylate: effect of citric acid.
MedLine Citation:
PMID:  21191766     Owner:  NLM     Status:  In-Process    
The aim of this study was to develop a pH-independent sustained release matrix tablets of doxazosin mesylate. The matrix tablets were prepared by direct compression technique using polyethylene oxide, sodium alginate and citric acid as a pH modifier. Formulations were evaluated for an in vitro drug release study, erosion study, and the microenvironmental pH was studied using the pH indicator methyl red. For formulations without citric acid, the extent and rate of drug release in simulated gastric fluid were much higher than those in simulated intestinal fluid. By adding the citric acid, the drug release rate in simulated intestinal fluid was increased, and microenvironmental pH values within the tablets were maintained at low pH during drug release. Furthermore, drug release from the matrix tablet containing 20% w/w citric acid was comparable to that from a commercial product, Cardura® XL, and a pH-independent release could be achieved. Therefore, the incorporation of citric acid as a pH modifier to Polyethylene oxide-sodium alginate matrix tablets effectively produced pH-independent doxazosin mesylate release profiles.
Kwang-Ho Cha; Thanh-Huyen Tran; Min-Soo Kim; Jeong-Soo Kim; Hee Jun Park; Junsung Park; Wonkyung Cho; Sung-Joo Hwang
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-12-30
Journal Detail:
Title:  Archives of pharmacal research     Volume:  33     ISSN:  0253-6269     ISO Abbreviation:  Arch. Pharm. Res.     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2010-12-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8000036     Medline TA:  Arch Pharm Res     Country:  Korea (South)    
Other Details:
Languages:  eng     Pagination:  2003-9     Citation Subset:  IM    
Center for Nanotechnology-based New Drug Dosage Form, College of Pharmacy, Chungnam National University, Daejeon 305-764, Korea.
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