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Related Experiment Videos

Evaluation and comparison of dissolution data derived from different modified release dosage forms: an alternative

V Pillay1, R Fassihi

  • 1Temple University, School of Pharmacy, Department of Pharmaceutical Sciences, 3307 North Broad Street, Philadelphia, PA 19140, USA.

Journal of Controlled Release : Official Journal of the Controlled Release Society
|October 31, 1998
PubMed
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Dissolution testing placement significantly impacts drug release from swellable systems, but not osmotic pumps. Modified methods ensuring full surface exposure improve dissolution data accuracy for controlled-release dosage forms.

Area of Science:

  • Pharmaceutical Sciences
  • Drug Delivery Systems
  • Pharmacokinetics

Background:

  • Dissolution testing is critical for solid oral dosage form development, quality control, and establishing in vitro-in vivo correlations (IVIVR).
  • Standard United States Pharmacopeia (USP) 23 dissolution methods may not adequately assess drug release from all controlled-release systems.
  • Positioning of dosage forms within the dissolution vessel can influence drug release kinetics.

Purpose of the Study:

  • To investigate the effect of delivery system positioning on drug release from various controlled-release systems.
  • To evaluate proposed modifications to dissolution methods for improved accuracy, focusing on full surface exposure.
  • To compare the performance of swellable floatable, swellable sticking, and osmotic pump delivery systems.

Main Methods:

Related Experiment Videos

  • Evaluated drug release from theophylline and diltiazem hydrochloride in swellable floatable, swellable sticking, and osmotic pump systems.
  • Tested dosage forms using standard USP 23 methods and a modified method with a ring/mesh device for full surface exposure.
  • Analyzed release profiles using time points (t50%, t70%, t90%), mean dissolution times (MDT), difference factor (f1), and similarity factor (f2).

Main Results:

  • Drug release from theophylline and diltiazem hydrochloride sticking systems was sensitive to positioning (P<0.05).
  • Floatable diltiazem hydrochloride systems showed no sensitivity to positioning with specific modifications (P>0.05), attributed to higher drug solubility.
  • Osmotic pump drug release remained consistent regardless of positioning or hydrodynamic conditions (P>0.05).

Conclusions:

  • The similarity factor (f2) is superior to individual time points or MDT for differentiating overall release patterns.
  • Full surface exposure of swellable sticking systems to the dissolution medium enhances drug release rates.
  • Modified dissolution methods ensuring full surface exposure provide more accurate evaluations of controlled-release dosage forms.