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Factors Influencing Drug Absorption: Pharmaceutical Parameters01:28

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Solid dosage forms such as tablets and capsules undergo rigorous manufacturing processes to ensure stability and effectiveness. Their dissolution and absorption properties are influenced significantly by the choice of excipients (inactive ingredients that serve various roles in the formulation), and the methodology applied during production. The manufacturing parameters, such as compression force and granulation techniques, significantly affect dissolution rates. Elevated compression forces...
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In Vitro Drug Dissolution: Compendial Testing Models I01:13

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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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Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
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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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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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Bioequivalence in generic drugs, such as tablets and capsules, refers to their pharmaceutical equivalence to the brand-name counterparts. However, for therapeutic equivalence, manufacturers must also consider physical attributes like size, shape, and weight (FDA Guidance for Industry, December 2003). Discrepancies in these aspects could impact patient compliance and cause medication errors. For instance, swallowing difficulties, often experienced with larger tablets or capsules, can lead to...
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Simulation of Unit Operations in Formulation Development of Tablets Using Computational Fluid Dynamics.

S Hemamanjushree1, Vamshi Krishna Tippavajhala2

  • 1Department of Pharmaceutics, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, India.

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|March 14, 2020
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Summary

Computational fluid dynamics (CFD) enhances tablet manufacturing by analyzing fluid dynamics in unit operations like granulation and coating. This review compiles research on CFD applications for optimizing tablet quality and efficiency.

Keywords:
Computational fluid dynamicsFormulation development of tabletsSimulation tools

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Area of Science:

  • Pharmaceutical Sciences
  • Chemical Engineering
  • Computational Science

Background:

  • Tablets are the primary solid oral dosage form, with manufacturing involving critical unit operations such as granulation, drying, die filling, and coating.
  • Tablet quality is significantly influenced by these unit operations and subsequent evaluation tests like dissolution and disintegration.
  • Optimizing fluid dynamics within these processes is essential for enhancing tablet manufacturing efficiency and product quality.

Purpose of the Study:

  • To critically analyze the impact of fluid properties and flow patterns on unit operations in tablet formulation.
  • To review the application of Computational Fluid Dynamics (CFD) in understanding and optimizing tablet manufacturing processes.
  • To compile existing research on CFD's role in various tablet formulation and evaluation steps.

Main Methods:

  • Utilizing Computational Fluid Dynamics (CFD), a mathematical and numerical approach, to simulate and analyze fluid behavior.
  • Solving fundamental conservation equations (mass, energy, momentum) numerically using specialized CFD software.
  • Compiling and reviewing a collection of research studies that have applied CFD to specific unit operations in tablet manufacturing.

Main Results:

  • CFD provides a detailed understanding of how fluid dynamics influence granulation, granule drying, die filling, and tablet coating.
  • Analysis of parameters like flow pattern, temperature, and velocity using CFD aids in identifying areas for process improvement.
  • The application of CFD enables prediction and optimization of tablet quality attributes through better control of manufacturing variables.

Conclusions:

  • Computational Fluid Dynamics is a powerful tool for dissecting complex fluid-related phenomena in tablet manufacturing.
  • CFD-driven insights are crucial for enhancing the efficiency and consistency of tablet production.
  • This review highlights the extensive utility of CFD across various stages of tablet formulation and evaluation, underscoring its importance in pharmaceutical process development.