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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 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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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...
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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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A concise review on smart polymers for controlled drug release.

Arezou Aghabegi Moghanjoughi1, Dorna Khoshnevis2, Ali Zarrabi3

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Smart polymers offer advanced drug delivery systems with controlled, tunable release. This review covers smart polymer types, mechanisms, and applications in healthcare.

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Area of Science:

  • Materials Chemistry
  • Biomedical Engineering
  • Polymer Science

Background:

  • Efficient drug delivery systems are crucial for healthcare.
  • Polymer innovations enable controlled and sustained drug release.
  • Smart polymers respond to environmental stimuli for advanced applications.

Purpose of the Study:

  • To review various smart polymers used in controlled drug delivery.
  • To highlight their mechanisms of action.
  • To discuss their diverse applications in medicine.

Main Methods:

  • Literature review of smart polymer research.
  • Analysis of polymer properties and drug release mechanisms.
  • Categorization of smart polymers based on stimuli-responsiveness.

Main Results:

  • Smart polymers offer tunable and responsive drug release profiles.
  • Examples include polymers sensitive to pH, temperature, and light.
  • These materials facilitate targeted and controlled therapeutic interventions.

Conclusions:

  • Smart polymers represent a significant advancement in drug delivery technology.
  • Their responsive nature allows for precise control over drug release kinetics.
  • Further research holds promise for novel therapeutic strategies.