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Modified-Release Drug Delivery Systems: Stimuli-Activated

Modified-Release Drug Delivery Systems: Stimuli-Activated

Stimuli-activated drug delivery systems are designed to release drugs in response to specific physical, chemical, or biological stimuli. These systems often utilize hydrogels—three-dimensional, hydrophilic polymer networks capable of swelling in aqueous environments and retaining significant fluid volumes. Upon exposure to particular stimuli, these hydrogels undergo structural transitions that allow the embedded drug to be released. Due to this adaptive behavior, such systems are also called...

Modified-Release Drug Delivery Systems: Rate-Programmed II

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 I

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,...

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...

Site-Targeted Drug Delivery Systems: Polymeric Carriers

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Polymeric carriers enhance targeted drug delivery by increasing efficacy while minimizing off-target effects. These carriers comprise a biodegradable polymeric backbone integrated with functional elements that enable targeting, improve physicochemical properties, and regulate drug release.Targeting MechanismsThe targeting ability of polymeric carriers is mediated by a homing device, which is a molecular recognition component designed to selectively bind to specific tissues or cells. Monoclonal...

Oral Drug Delivery Systems: Delayed-Release Systems

Oral Drug Delivery Systems: Delayed-Release Systems

Delayed-release drug delivery systems are specialized pharmaceutical formulations designed to postpone the release of active compounds until the drug reaches a specific region of the gastrointestinal (GI) tract, typically the intestine. These systems are essential for drugs that may cause gastric irritation, are unstable in acidic environments, or need to exert therapeutic effects locally in the intestinal or colonic regions.The core feature of delayed-release systems is the use of enteric...

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Related Experiment Video

Updated: Jun 16, 2026

Alternating Magnetic Field-Responsive Hybrid Gelatin Microgels for Controlled Drug Release

Alternating Magnetic Field-Responsive Hybrid Gelatin Microgels for Controlled Drug Release

Published on: February 13, 2016

Sponge-like nanostructured conducting polymers for electrically controlled drug release.

Xiliang Luo¹, Xinyan Tracy Cui

¹Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15260, United States.

Electrochemistry Communications

|February 18, 2010

Summary

Researchers developed an electrically controlled drug release system using polypyrrole (PPy) nanostructures. This advanced system enhances drug loading and enables simultaneous release of multiple medications triggered by electrical stimulation.

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Last Updated: Jun 16, 2026

Alternating Magnetic Field-Responsive Hybrid Gelatin Microgels for Controlled Drug Release

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Published on: February 13, 2016

Electroactive Polymer Nanoparticles Exhibiting Photothermal Properties

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Published on: January 8, 2016

Nanosponge Tunability in Size and Crosslinking Density

Nanosponge Tunability in Size and Crosslinking Density

Published on: August 4, 2017

Area of Science:

Materials Science
Biomedical Engineering
Nanotechnology

Background:

Developing efficient drug delivery systems is crucial for targeted and controlled therapeutic interventions.
Conducting polymers offer unique properties for advanced biomedical applications, including drug release.

Purpose of the Study:

To develop a novel electrically controlled drug release (ECDR) system utilizing nanostructured conducting polymers.
To enhance drug loading capacity and release efficiency through a unique sponge-like polypyrrole (PPy) architecture.
To demonstrate the capability for simultaneous release of multiple drugs using electrical stimulation.

Main Methods:

Fabrication of a sponge-like nanostructured polypyrrole (PPy) film via template synthesis.
Incorporation of drug molecules within the PPy polymer backbones and nanoholes.
Application of electrical stimulation to trigger drug release from the PPy nanostructures.

Main Results:

The nanostructured PPy film exhibited improved drug loading and release efficiency.
Electrical stimulation effectively triggered the release of drugs from both polymer backbones and nanoholes.
Simultaneous release of two different drugs, one from the backbone and another from the nanoholes, was successfully achieved.

Conclusions:

The developed PPy-based ECDR system offers a promising platform for enhanced drug delivery.
The nanostructured design significantly improves drug loading and release kinetics.
The system's ability to deliver multiple drugs simultaneously via electrical control opens new therapeutic possibilities.