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Tishreen University رسالة ماجستير
Publication date
2012
fields
Pharmacy
and research's language is
العربية
Created by
Shamra Editor
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تلبي الأشكال الصيدلية ذات التحرر المعدل مطالب عدة لا يمكن تحقيقها عادة بالأشكال التقليدية . من هذه المطالب اراحة المريض وتحسين مطاوعته للعلاج
No English abstract
References used
British pharmacopeia 2009
rate research
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تلبي الأشكال الصيدلية ذات التحرر المعدل مطالب عدة لا يمكن تحقيقها عادة بالأشكال التقليدية . من هذه المطالب اراحة المريض وتحسين مطاوعته للعلاج
Nifedipine is one of the most used calcium channel blocking agents. Due to its low aqueous solubility, it often shows low and irregular bioavailability after oral administration. Nifedipine has short half-life so it has to be administered many times
a day. Immediate-release formulations increase the risk of myocardial infarction and mortality. This research aims to prepare dual-function drug delivery system to enhance nifedipine solubility using solid dispersion technique, and extend its release by incorporating these dispersions in matrix tablets. 32 Factorial design was employed; two independent variables, Poloxamer 188 and Ethyl cellulose, to improve solubility and extend release respectively, were used in 3 levels. The prepared tablets were examined, and succeeded in extending nifedipine release up to 12 hrs. The equations that link the dependent and independent variables were obtained, through which tablet hardness and the released amount after 1, 4 and 6 hours could be predicted.
The purpose of this study was to prepare prolonged release tablets of verapamil: matrix and coated tablets, because of the importance of these systems in drug delivery and improving the patient compliance and therapeutic efficacy .Different formula
tions were prepared by using different release-modifiers polymers (EURL100 and EURS100). Direct compression technique was used to prepare coated tablets while matrix tablets were prepared by wet granulation and direct compression methods. The prepared formulations were evaluated in terms of their precompression parameters, physical characteristics, dissolution test and in vitro drug release kinetic studies. The results showed that matrix tablets containing 7.5or10% of EuRS100 and EuRL100 respectively and that coated tablets prepared by using coating solution (15%) which was applied about 120(in case of EuRS100) or 280 (in case of EuRL100) times were the best. These tablets released about 90-95% of verapamil within 24h
The aim of the present study is to prepare extended hard capsules of furosemide using
Eudragit RL, Eudragit RS and Ethyl cellulose individually and in different ratios (6,8,12 and
15%). The granules were prepared by wet granulation using isopropyl
alcohol as a
granulating agent and then filled into capsules. The influence of different concentrations and
type of polymer was studied. The prepared capsules assessed for their physicochemical
properties and in-vitro drug release studies. In vitro release data show that Ethyl cellulose
has more retardation than Eudragits, and Eudragit RS retards drug more than Eudragit RL
does. Furthermore, higher concentration of polymer tends to more retardation than lower
concentration.
The objective of the present study was to formulate methyldopa sustained release
matrix tablets using hydrophilic hydroxypropyl methylcellulose (HPMC) alone or in
combination with hydrophobic ethyl cellulose polymer(EC). Matrix tablets were prepare
d
by wet granulation method, and subjected to physiochemical studies. All formulations
showed physiochemical properties which appear to be in compliance with pharmacopeial
standards. The in-vitro dissolution studies showed that increase in concentration or
viscosity of HPMC polymer led to decrease in the rate of drug release decreased. The
results also revealed that Combination of HPMC K4M and EC slower drug release more
than using HPMC K4M alone. Drug release kinetics of about all formulations correspond
best to Korsemeyer-Peppas model and drug release mechanism was anomalous diffusion
based on release exponent value.
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