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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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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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Continuous-release drug delivery systems offer a strategic approach to maintaining therapeutic drug levels over extended periods following oral administration. By modulating the release rate of active pharmaceutical ingredients, these systems minimize fluctuations in plasma concentrations, which enhances clinical efficacy and reduces the need for frequent dosing. Such characteristics make them particularly advantageous in managing chronic diseases where patient adherence and stable drug...
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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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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...
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This study introduces a novel sustained-release soft gelatin capsule formulation using ethylcellulose, sesame oil, and polyethylene glycol. The new formulation allows for controlled drug release, offering potential advancements in pharmaceutical delivery systems.

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Area of Science:

  • Pharmaceutical Sciences
  • Materials Science

Background:

  • Development of sustained-release drug delivery systems is crucial for improving therapeutic efficacy and patient compliance.
  • Traditional soft gelatin capsules have limitations in controlling drug release rates.
  • Novel excipients and formulation strategies are needed to enhance drug release profiles.

Purpose of the Study:

  • To investigate a new formulation for sustained-release soft gelatin capsules.
  • To evaluate the potential of ethylcellulose, sesame oil, and polyethylene glycol in a novel gel solid matrix.
  • To determine the influence of formulation components on drug release characteristics.

Main Methods:

  • Formulation of a gel solid using ethylcellulose and sesame oil, incorporating polyethylene glycol 400.
  • Utilizing citric acid triethylester (Citroflex-2) to combine sesame oil and polyethylene glycol.
  • Rheological analysis at various temperatures to ascertain thixotropic properties and determine optimal filling temperatures.
  • Investigating drug release profiles of codeine and theophylline from the developed matrix system.

Main Results:

  • The formulation demonstrated thixotropic properties suitable for gel formation and capsule filling.
  • Drug release studies showed typical matrix-type release for dissolved or suspended codeine.
  • High concentrations of theophylline resulted in an erodible matrix with an almost-constant release rate.

Conclusions:

  • A novel sustained-release soft gelatin capsule formulation was successfully developed.
  • The formulation components and their interactions influence the drug release mechanism (matrix-type vs. erodible).
  • Rheological characterization is a valuable tool for optimizing the manufacturing process and predicting release behavior.