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Related Concept Videos

Site-Targeted Drug Delivery Systems: Polymeric Carriers01:24

Site-Targeted Drug Delivery Systems: Polymeric Carriers

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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Modified-Release Drug Delivery Systems: Site-Targeted

Site-targeted drug delivery systems enhance therapeutic efficacy while minimizing systemic toxicity and treatment costs. Unlike conventional methods, these systems ensure precise drug delivery, improving bioavailability and reducing side effects. Targeted drug delivery is classified into three levels. First-order targeting directs drugs to the capillary beds of specific organs or tissues. Second-order targets specific cell types, such as tumor cells, using receptor-mediated interactions.
Oral Drug Delivery Systems: Delayed-Release Systems01:11

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...
Bioavailability Enhancement: Drug Stability Enhancement and GI Retention01:05

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Improving a drug's stability in the gastrointestinal (GI) tract is paramount for enhancing its bioavailability and therapeutic effectiveness. Various strategies are employed to protect the drug from the harsh gastric milieu and to ensure its release and absorption at the desired site within the GI tract.Polymer coatings are one such method used to shield drugs from the stomach's acidic environment. By preventing premature drug release, these coatings improve the bioavailability of unstable...
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...
Modified-Release Drug Delivery Systems: Classification01:23

Modified-Release Drug Delivery Systems: Classification

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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Polymalic Acid-based Nano Biopolymers for Targeting of Multiple Tumor Markers: An Opportunity for Personalized Medicine?
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Polymers for colon targeted drug delivery.

H Rajpurohit1, P Sharma, S Sharma

  • 1Faculty of Pharmaceutical Sciences, Jodhpur National University, Jodhpur - 342 008, India.

Indian Journal of Pharmaceutical Sciences
|October 5, 2011
PubMed
Summary

Oral colon targeted drug delivery systems protect medications from degradation in the upper gastrointestinal tract. These systems ensure precise drug release in the colon for effective local or systemic pharmacotherapy.

Keywords:
Biodegradable polymerscolon targeted deliverycontrolled deliverypolysaccharides

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Area of Science:

  • Pharmacotherapy
  • Drug Delivery Systems
  • Polymer Science

Background:

  • Colon targeted drug delivery is crucial for effective pharmacotherapy, enabling local and systemic drug administration.
  • Oral colon targeted systems protect drugs from degradation in the stomach and small intestine.
  • These systems are designed for abrupt or controlled drug release specifically in the proximal colon.

Purpose of the Study:

  • To review various polymer types suitable for formulating colon targeted drug delivery systems.
  • To highlight the importance of colon targeting in modern drug delivery strategies.

Main Methods:

  • Literature review of existing colon targeted drug delivery systems.
  • Analysis of polymer properties relevant to colon targeting and drug release.

Main Results:

  • Multiple drug delivery systems have been developed for quantitative colon delivery and triggered drug release.
  • A variety of polymers can be employed in the formulation of these specialized systems.

Conclusions:

  • Colon targeted drug delivery offers significant advantages for therapeutic agent administration.
  • The selection of appropriate polymers is key to successful colon targeted drug delivery system design.