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Modified-Release Drug Delivery Systems: Drug Release Characteristics

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...

Modified-Release Drug Delivery Systems: Influencing Factors

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Modified-release drug delivery systems are designed to optimize the therapeutic effect of drugs by minimizing side effects, reducing the dosage required, and controlling drug release to align with pharmacokinetic and pharmacodynamic needs. The system depends on two key factors: the drug's release from the formulation and its movement through the body to the target site. Unlike conventional dosage forms, where absorption is the limiting step, the rate of drug release is the key determinant in...

Modified-Release Drug Delivery Systems: Rate-Programmed II

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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: Overview

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Modified-release dosage forms are designed to address the limitations of drugs with short biological half-lives. These forms maintain stable therapeutic drug concentrations over extended periods, reducing the need for frequent dosing. A consistent drug level helps minimize peak-trough fluctuations, which can reduce adverse effects, lower the risk of drug resistance, and improve overall treatment effectiveness.One common type of modified-release form is the extended-release (ER) formulation. ER...

Modified-Release Drug Delivery Systems: Rate-Programmed I

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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,...

Modified-Release Drug Delivery Systems: Classification

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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...

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Preformulation considerations for controlled release dosage forms. Part III. Candidate form selection using numerical weighting and scoring.

AAPS PharmSciTech·2008

Same author

Preformulation considerations for controlled release dosage forms. Part I. Selecting candidates.

AAPS PharmSciTech·2008

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Related Experiment Video

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Preparation and Characterization of Individual and Multi-drug Loaded Physically Entrapped Polymeric Micelles

Preparation and Characterization of Individual and Multi-drug Loaded Physically Entrapped Polymeric Micelles

Published on: August 28, 2015

Preformulation considerations for controlled release dosage forms. Part II. Selected candidate support.

Frank Chrzanowski¹

¹FA Chrzanowski, Inc., Marlton, New Jersey 08053-1320, USA. frankchrzan@comcast.net

AAPS Pharmscitech

|April 24, 2008

Summary

This study provides practical preformulation strategies for drug substances (DSs), focusing on solubility, polymorphism, and stability. It highlights methods for predicting drug product stability and developing specialized dosage forms for sensitive compounds.

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Area of Science:

Pharmaceutical Sciences
Drug Development
Materials Science

Background:

Preformulation studies are critical for successful drug formulation and development.
Understanding drug substance (DS) properties like solubility, stability, and polymorphism is essential.
Challenges exist in predicting long-term stability and formulating sensitive compounds.

Purpose of the Study:

To provide practical examples of preformulation support for drug substances (DSs).
To detail methods for assessing solubility, polymorphism, and stability.
To compare methods for predicting excipient compatibility and formulation stability.

Main Methods:

Solubility determination (equilibrium and trial methods) across a pH range (1-8).
Accelerated stability studies using HPLC and quantitative X-ray powder diffraction (QXRD).
Comparison of Differential Scanning Calorimetry (DSC) and Isothermal Stress with Quantitative Analysis (ISQA) for excipient compatibility.

Main Results:

Demonstrated detection of unstable polymorphs and assessment of chemical/polymorphic stability.
Identified a more predictive method for room temperature stability between DSC and ISQA.
Provided insights into pH-stability profiles for sensitive drugs like omeprazole and lansoprazole.

Conclusions:

Preformulation methods effectively support formulation development and stability prediction.
Specific methods aid in addressing challenges with sensitive drug substances and developing specialized dosage forms.
The study offers practical approaches for optimizing drug product development and ensuring stability.