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Related Concept Videos

Modified-Release Drug Delivery Systems: Stimuli-Activated01:30

Modified-Release Drug Delivery Systems: Stimuli-Activated

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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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Modified-Release Drug Delivery Systems: Site-Targeted01:24

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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.
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Modified-Release Drug Delivery Systems: Classification01:23

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...
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Parenteral Drug Delivery Systems: Injectables, Implants, and Infusion Devices01:28

Parenteral Drug Delivery Systems: Injectables, Implants, and Infusion Devices

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Parenteral drug delivery systems play a crucial role in modern therapeutics by enabling the direct administration of drugs into the systemic circulation, bypassing the gastrointestinal tract. These systems are particularly valuable for poorly absorbed oral medications that are unstable in the digestive environment or require rapid onset or sustained therapeutic levels. Delivery is achieved through intravenous, intramuscular, or subcutaneous routes, each selected based on the drug's properties...
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Modified-Release Drug Delivery Systems: Rate-Programmed II01:19

Modified-Release Drug Delivery Systems: Rate-Programmed II

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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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Intrauterine Drug Delivery Systems01:21

Intrauterine Drug Delivery Systems

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Controlled-release systems for intravaginal and intrauterine drug delivery have been developed primarily for the administration of contraceptive steroid hormones. These delivery routes circumvent first-pass hepatic metabolism, thereby enhancing bioavailability and allowing for reduced systemic dosages compared to oral administration. Such approaches contribute to improved therapeutic efficacy and patient compliance, particularly in long-term contraceptive regimens.Intravaginal Drug Delivery...
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Adenosine-associated delivery systems.

Mehdi Kazemzadeh-Narbat1,2,3, Nasim Annabi1,2,4,5, Ali Tamayol1,2

  • 1a Division of Biomedical Engineering, Department of Medicine , Biomaterials Innovation Research Center, Brigham and Women's Hospital, Harvard Medical School , Boston , MA , USA .

Journal of Drug Targeting
|October 11, 2015
PubMed
Summary
This summary is machine-generated.

Adenosine offers therapeutic potential but faces challenges due to side effects and a short half-life. This review explores advanced adenosine delivery systems to improve efficacy and reduce adverse events.

Keywords:
Adenosinecontrolled drug deliverycontrolled releasedrug deliverydrug targetingnanoparticlestargeted drug delivery

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Area of Science:

  • Biomedical Engineering
  • Pharmacology
  • Drug Delivery Systems

Background:

  • Adenosine is a vital nucleoside with therapeutic applications in arrhythmias, CNS disorders, and seizures.
  • Systemic administration of adenosine is limited by severe side effects and a very short biological half-life (<10 seconds).

Purpose of the Study:

  • To critically review various adenosine delivery techniques.
  • To highlight existing challenges in developing effective adenosine delivery systems.

Main Methods:

  • Review of current literature on adenosine delivery strategies.
  • Analysis of encapsulation, cell-based, biomaterial, and mechanical delivery systems.

Main Results:

  • Various advanced delivery systems show promise for sustained adenosine release.
  • Significant challenges remain in optimizing these systems for clinical translation.

Conclusions:

  • Novel adenosine delivery systems are crucial for enhancing therapeutic efficacy and minimizing side effects.
  • Further research is needed to overcome technical hurdles for widespread clinical adoption.