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Related Experiment Videos

Novel mucoadhesive oral patch containing diazepam.

Hiraku Onishi1, Osamu Sakata, Kosuke Masuda

  • 1Department of Drug Delivery Research, Hoshi University, Tokyo, Japan. onishi@hoshi.ac.jp

Drug Development and Industrial Pharmacy
|October 7, 2005
PubMed
Summary

This study developed an oral diazepam (DZ) patch for rapid emergency treatment. The patch with oleic acid (OA) significantly enhanced DZ absorption in rats, proving effective for quick therapeutic delivery.

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Area of Science:

  • Pharmaceutical Sciences
  • Drug Delivery Systems
  • Biomedical Engineering

Background:

  • Epileptic seizures and anxiety disorders require rapid-acting treatments.
  • Traditional administration routes for diazepam (DZ) may not provide sufficiently rapid absorption.
  • Oral drug delivery offers a non-invasive alternative, but achieving rapid absorption remains a challenge.

Purpose of the Study:

  • To develop and evaluate an oral mucoadhesive patch for rapid diazepam (DZ) absorption.
  • To investigate the effect of oleic acid (OA) as an absorption enhancer in the DZ oral patch.
  • To assess the efficacy of the DZ oral patch for emergency treatment applications.

Main Methods:

  • Formulation of oral diazepam patches with and without oleic acid (OA) using Carbopol 934 and Tegaderm.

Related Experiment Videos

  • In vivo pharmacokinetic study in rats by applying patches to buccal mucosa.
  • In vitro drug permeation studies using a cellulose membrane to assess release characteristics.

    • Main Results:

    • The oral patch containing OA achieved rapid diazepam (DZ) plasma levels (>200 ng/mL within 10 min) in rats.
    • The patch without OA showed significantly lower plasma concentrations (<30 ng/mL over 40 min).
    • In vitro, the patch without OA exhibited a faster permeation rate, suggesting OA enhances absorption via mucosal interaction.

    Conclusions:

    • The oral diazepam patch formulated with oleic acid demonstrates efficient and rapid absorption through the oral mucosa.
    • Oleic acid acts as an effective absorption enhancer, potentially through direct interaction with the oral mucosa.
    • This mucoadhesive patch formulation shows promise for the emergency treatment of epileptic seizures and anxiety disorders.