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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...

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Dispersion of Nanomaterials in Aqueous Media: Towards Protocol Optimization

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Published on: December 25, 2017

Controlled release systems containing solid dispersions: strategies and mechanisms.

Phuong Ha-Lien Tran¹, Thao Truong-Dinh Tran, Jun Bom Park

¹Bioavailability Control Laboratory, College of Pharmacy, Kangwon National University, 1 University Road, Hyoja-Dong, Chuncheon, 200-701, Republic of Korea.

Pharmaceutical Research

|May 10, 2011

Summary

Controlled-release solid dispersions enhance drug dissolution and bioavailability for poorly water-soluble drugs. This approach combines immediate and sustained drug release, improving therapeutic outcomes and patient compliance.

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Area of Science:

Pharmaceutical Sciences
Drug Delivery Systems

Background:

Poorly water-soluble drugs often exhibit low bioavailability due to insufficient dissolution rates and small absorption windows.
Controlled-release (CR) formulations offer advantages like improved patient compliance, reduced dosing frequency, and minimized side effects.

Purpose of the Study:

To review controlled-release systems incorporating solid dispersions (CR-SD) for poorly water-soluble drugs.
To summarize preparation methods, mechanisms of action, and physicochemical characterization of CR-SD systems.

Main Methods:

Literature review of controlled release systems containing solid dispersions.
Focus on preparation techniques, action mechanisms, and property characterization.

Main Results:

Solid dispersions (SD) enhance drug dissolution and can sustain drug release.
CR-SD systems combine SD benefits with CR properties, providing immediate and prolonged drug release.
This dual function maintains therapeutic plasma concentrations for poorly water-soluble drugs.

Conclusions:

CR-SD formulations are effective for improving the delivery of poorly water-soluble drugs.
These systems offer a promising strategy for enhancing bioavailability and therapeutic efficacy.