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Related Concept Videos

Modified-Release Drug Delivery Systems: Drug Release Characteristics01:22

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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: 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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In Vitro Drug Dissolution: Compendial Testing Models II01:09

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Various dissolution methods are utilized to assess a drug’s dissolution rate, including the flow-through cell, paddle-over-disk, cylinder, and reciprocating disk methods.The flow-through cell apparatus (USP (United States Pharmacopeia) method 4) comprises a reservoir for the dissolution medium and a pump that propels the medium through the cell containing the test sample. This method is crucial for assessing modified-release dosage forms with minimally soluble active ingredients,...
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Compendial dissolution methods are standardized procedures defined by pharmacopeias to evaluate the rate at which a drug dissolves in a specific medium. These methods ensure batch-to-batch consistency, enable quality control, and support the prediction of drug bioavailability. They are critical for both immediate and modified-release drug products.The apparatuses used for dissolution testing differ in their design and mechanical function, but all aim to simulate the physiological environment of...
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Modified-Release Drug Delivery Systems: Rate-Programmed II01:19

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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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Alternative drug dissolution methods include the rotating bottle, intrinsic dissolution test, peristalsis, and the Franz diffusion cell method. The rotating bottle method involves meticulously rotating tightly capped controlled-release beads in a temperature-controlled bath. Periodic decanting of samples allows for residue assay, followed by refilling with fresh medium and testing at various pH levels to emulate the gastrointestinal tract conditions.In contrast, the intrinsic dissolution test...
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A dynamic device to simulate intraarticular drug-release kinetics.

Mehmet D Asik1, Aybike Reyhanli1, Maria Fernanda Serafim2

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A novel Dynamic Release Device (DRD) mimics joint environments for drug delivery testing. This system improves prediction of drug concentrations, aiding clinical translation of intraarticular drug delivery devices.

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Area of Science:

  • Biomedical Engineering
  • Pharmacology
  • Drug Delivery Systems

Background:

  • Pharmacokinetic/pharmacodynamic (PK/PD) modeling is vital for intraarticular drug delivery devices.
  • Current in vitro methods lack in vivo-in vitro correlation for drug elution kinetics.
  • A need exists for testing strategies that incorporate joint-specific anatomical and physiological factors.

Purpose of the Study:

  • To develop a novel in vitro testing device, the Dynamic Release Device (DRD), simulating the joint space.
  • To investigate the influence of various parameters on drug release kinetics within the DRD.
  • To compare the DRD system with traditional testing methods for pharmacokinetic assessment.

Main Methods:

  • Development of the Dynamic Release Device (DRD) with dual chambers to control diffusion, perfusion, and clearance.
  • Systematic evaluation of fluid flow, flow rate, temperature, and membrane properties on drug elution.
  • Simulation of systemic drug administration effects on local concentrations.
  • Comparative analysis of drug delivery device performance in DRD versus sample-and-separate systems.

Main Results:

  • The DRD successfully mimics key joint parameters affecting drug release kinetics.
  • Demonstrated significant effects of fluid dynamics, temperature, and membrane characteristics on drug half-life and elution.
  • Simulated systemic administration impacts on local drug concentrations were evaluated.
  • DRD showed distinct pharmacokinetic behavior compared to conventional testing methods.

Conclusions:

  • The Dynamic Release Device (DRD) is a promising in vitro system for evaluating intraarticular drug delivery.
  • DRD incorporates crucial physiological parameters for accurate drug transport and clearance assessment.
  • This system can enhance preclinical testing of drug delivery devices for clinical translation.