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Modified-Release Drug Delivery Systems: Rate-Programmed II01:19

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...
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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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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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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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Transdermal Drug Delivery Systems

Transdermal drug delivery systems (TDDS) enable the controlled release of drugs across the skin into systemic circulation. They are particularly advantageous for drugs with short half-lives or narrow therapeutic indices, as they maintain consistent plasma concentrations and reduce the risk of subtherapeutic or toxic levels.TDDS are categorized into monolithic, reservoir, and mixed systems. Monolithic systems embed the drug in a polymer matrix, where diffusion governs release. Reservoir systems...
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Conventional oral drug products, termed immediate-release (IR) formulations, are engineered to promptly release their active pharmaceutical ingredient (API) upon ingestion, typically in tablets or capsules. This rapid release often results in swift drug absorption and consequent pharmacodynamic effects, although the timing and intensity can vary depending on the drug's properties. Prodrugs within these formulations require metabolic conversion to activate their pharmacodynamic effects,...

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Drug delivery from ordered mesoporous matrices.

Miguel Manzano1, Montserrat Colilla, María Vallet-Regí

  • 1Universidad Complutense de Madrid, Departamento de Química Inorgánica y Bioinorgánica, Facultad de Farmacia, E-28040-Madrid, Spain.

Expert Opinion on Drug Delivery
|November 28, 2009
PubMed
Summary
This summary is machine-generated.

Silica-based ordered mesoporous materials (SMMs) offer versatile and stable platforms for advanced drug delivery. These materials enable tailored drug loading and stimuli-responsive release, enhancing therapeutic efficacy for various clinical applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Growing research interest in silica-based ordered mesoporous materials (SMMs) for drug delivery.
  • SMMs offer high versatility and stability as mesoporous matrices.
  • Potential for improved therapeutic efficacy compared to conventional systems.

Purpose of the Study:

  • To review current research on SMMs as drug delivery systems.
  • To explore potential applications in biomedical technologies.
  • To highlight the design flexibility and stimuli-responsive capabilities of SMMs.

Main Methods:

  • Review of existing literature on silica-based ordered mesoporous materials.
  • Analysis of chemical strategies for tailoring SMMs for specific drugs and clinical needs.
  • Examination of stimuli-responsive release mechanisms in SMMs.

Main Results:

  • SMMs can be designed and tailored using various chemical strategies.
  • Stimuli-responsive systems allow for controlled opening and closing of SMM channels for drug release.
  • SMMs demonstrate versatility for both oral and local drug delivery.

Conclusions:

  • Silica-based ordered mesoporous materials are promising for advanced drug delivery.
  • Their tunable properties and stimuli-responsive release offer significant advantages.
  • SMMs have broad potential applications across diverse clinical areas.