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Related Concept Videos

Modified-Release Drug Delivery Systems: Drug Release Characteristics01:22

Modified-Release Drug Delivery Systems: Drug Release Characteristics

Drug release from modified-release dosage forms is designed to achieve specific therapeutic effects by controlling the rate and extent of drug release. The classification of these drug release systems is based on key pharmacokinetic assumptions: drug disposition follows first-order kinetics, drug release is the rate-limiting step in absorption, and the released drug is rapidly and completely absorbed.There are four major models of drug release patterns. The first model is the slow zero-order...
Drug Delivery Systems: Different Types01:27

Drug Delivery Systems: Different Types

Conventional oral drug products, termed immediate-release (IR) formulations, are engineered to promptly release their active pharmaceutical ingredient (API) upon ingestion, typically in tablets or capsules. This rapid release often results in swift drug absorption and consequent pharmacodynamic effects, although the timing and intensity can vary depending on the drug's properties. Prodrugs within these formulations require metabolic conversion to activate their pharmacodynamic effects,...
Modified-Release Drug Delivery Systems: Classification01:23

Modified-Release Drug Delivery Systems: Classification

Modified-release drug delivery systems improve drug efficacy and minimize side effects by controlling the rate and location of drug release. These systems fall into three categories: rate-programmed, stimuli-activated, and site-targeted.Rate-programmed systems release drugs at a predetermined rate, maintaining consistent therapeutic levels and reducing fluctuations that could lead to toxicity or subtherapeutic effects. These systems use polymeric matrices, reservoir-based designs, or osmotic...
Modified-Release Drug Delivery Systems: Rate-Programmed II01:19

Modified-Release Drug Delivery Systems: Rate-Programmed II

Rate-programmed drug delivery systems release drugs in a controlled manner to maintain therapeutic levels. Three main designs include reservoir, matrix, and hybrid systems.Reservoir systems consist of a drug core enclosed within a membrane that controls drug release. In non-swelling reservoir systems, polymers like ethyl cellulose or polymethacrylates are used. These do not hydrate in aqueous media and control release through membrane thickness, porosity, or insolubility. This type includes...
Modified-Release Drug Delivery Systems: Rate-Programmed I01:22

Modified-Release Drug Delivery Systems: Rate-Programmed I

Rate-programmed drug delivery systems (DDS) are designed to release drugs at specific, controlled rates to maintain consistent therapeutic levels. These systems are categorized based on their release mechanisms, including dissolution-controlled DDS, diffusion-controlled DDS, and combined dissolution-diffusion-controlled DDS.In dissolution-controlled DDS, the release rate depends on the slow dissolution of the drug itself or the surrounding matrix. Drugs with inherently slow dissolution rates,...
Oral Drug Delivery Systems: Introduction01:23

Oral Drug Delivery Systems: Introduction

Oral drug delivery is the most common route of administration due to its convenience, cost-effectiveness, and high patient compliance. It enables precise formulation to ensure proper drug dosage and bioavailability. The development of oral dosage forms considers drug properties such as solubility, stability, and absorption to optimize therapeutic efficacy.Tablets, capsules, liquids, and chewable formulations enhance drug stability, mask undesirable tastes, and improve patient experience.

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Active compounds release from semisolid dosage forms.

Anna Olejnik1, Joanna Goscianska, Izabela Nowak

  • 1Adam Mickiewicz University in Poznan, Faculty of Chemistry, ul. Umultowska 89b, 61-714 Poznań, Poland. annamar@amu.edu.pl

Journal of Pharmaceutical Sciences
|August 14, 2012
PubMed
Summary

This review explores in vitro release testing (IVRT) for semisolid dosage forms. It discusses factors influencing drug release kinetics and anticipates future standardized methods for topical and transdermal products.

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Area of Science:

  • Pharmaceutical Sciences
  • Drug Delivery Systems

Background:

  • In vitro release testing (IVRT) is crucial for evaluating drug release from semisolid dosage forms like creams and ointments.
  • Standardized dissolution methods for these dosage forms are currently lacking in official pharmacopeias.

Purpose of the Study:

  • To comprehensively review the various aspects of in vitro release testing (IVRT) for semisolid dosage forms.
  • To highlight the factors affecting drug release kinetics and discuss their influence on testing outcomes.

Main Methods:

  • Literature review of existing studies on in vitro release testing (IVRT) for semisolid formulations.
  • Discussion of critical parameters influencing drug release, including dissolution medium, membrane type, temperature, and agitation speed.

Main Results:

  • In vitro release testing (IVRT) is a valuable tool for assessing drug release from semisolid formulations, despite the absence of official standardized methods.
  • Key parameters such as dissolution medium composition, membrane characteristics, temperature, and testing speed significantly impact release profiles.
  • The development of official "Topical and Transdermal Drug Products-Product Performance Tests" is anticipated to standardize these evaluations.

Conclusions:

  • In vitro release testing (IVRT) is essential for quality control and performance assessment of semisolid drug products.
  • Optimization of testing parameters is critical for reliable and reproducible in vitro release data.
  • Future pharmacopeial guidelines will likely enhance the standardization and regulatory acceptance of IVRT for semisolid dosage forms.