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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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Modified-Release Drug Delivery Systems: Rate-Programmed I01:22

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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,...
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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...
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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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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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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...
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Alternating Magnetic Field-Responsive Hybrid Gelatin Microgels for Controlled Drug Release
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Multimonth controlled small molecule release from biodegradable thin films.

Bryan B Hsu1, Myoung-Hwan Park2, Samantha R Hagerman3

  • 1Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139;Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139;Institute for Soldier Nanotechnologies, Cambridge, MA 02139; and.

Proceedings of the National Academy of Sciences of the United States of America
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Summary

Researchers developed a novel polymer thin film for sustained, localized drug delivery. This biodegradable film provides over 14 months of controlled release for small molecules, reducing systemic toxicity and intervention needs.

Keywords:
NSAIDpolyelectrolyte multilayerspolymer prodrug

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Area of Science:

  • Biomaterials Science
  • Drug Delivery Systems
  • Polymer Chemistry

Background:

  • Localized drug delivery of small molecules via thin films faces challenges due to low molecular weight and poor charge density.
  • Extended controlled release is crucial for maintaining therapeutic levels, minimizing systemic toxicity, and reducing intervention frequency.

Purpose of the Study:

  • To develop a novel formulation for sustained, localized delivery of small molecules using biodegradable thin films.
  • To achieve high drug loading and predictable, long-term release from thin film coatings on implantable devices.

Main Methods:

  • Utilized a soluble charged polymer-drug conjugate immobilized into nanoscale, layer-by-layer assembled films.
  • Developed conformal thin films (0.5-2.7 μm) applicable to various substrate surfaces.
  • Demonstrated sustained release using diclofenac, a nonsteroidal anti-inflammatory drug.

Main Results:

  • Achieved highly predictable sustained drug release for over 14 months.
  • Maintained physiologically relevant drug concentrations, indicating therapeutic efficacy.
  • Demonstrated the potential for high drug loading within the thin film coatings.

Conclusions:

  • The developed polymer thin film formulation enables long-term, localized delivery of small molecules.
  • This advance in drug delivery can significantly reduce systemic toxicity and the need for frequent medical interventions.
  • The technology holds promise for managing chronic pain and inflammatory conditions like osteoarthritis.