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Updated: Aug 13, 2025

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Reverse engineering the Ozurdex dexamethasone intravitreal implant.

Mark A Costello1, Joseph Liu1, Yan Wang2

  • 1University of Texas at Austin, College of Pharmacy, Department of Molecular Pharmaceutics and Drug Delivery, Austin, TX, USA.

International Journal of Pharmaceutics
|January 23, 2023
PubMed
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Researchers reverse-engineered Ozurdex, a sustained-release dexamethasone implant for eye conditions. This study characterized the implant and developed a similar version, aiding future generic drug development.

Area of Science:

  • Ophthalmology
  • Materials Science
  • Pharmaceutical Sciences

Background:

  • Ozurdex is a biodegradable implant delivering dexamethasone to the posterior eye segment for up to six months.
  • Sustained drug release is achieved using a poly(lactic-co-glycolic acid) (PLGA) matrix.

Purpose of the Study:

  • To enable reverse engineering of a compositionally and structurally equivalent implant to Ozurdex.
  • To provide insights into the manufacturing and characterization of PLGA-based solid implants for generic product development.

Main Methods:

  • Utilized advanced imaging techniques like scanning electron microscopy (SEM) and microcomputed tomography (microCT) for implant characterization.
  • Conducted thermal and spectroscopic analyses to understand drug-polymer interactions.
  • Employed a two-step hot-melt extrusion process for preparing reverse-engineered implants.
Keywords:
DexamethasoneHot-melt extrusionImplantOzurdexPLGAReverse engineering

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Main Results:

  • The Ozurdex implant has an irregular surface and 6% internal porosity with 3 μm voids.
  • Dexamethasone crystals are embedded within the PLGA matrix, indicating limited drug-polymer interaction.
  • Reverse-engineered implants demonstrated a triphasic drug release profile similar to Ozurdex.

Conclusions:

  • Characterization of the Ozurdex implant revealed key structural and compositional features.
  • A reproducible method for creating compositionally and structurally similar implants was developed.
  • This research supports the development of generic versions of sustained-release dexamethasone implants for ophthalmic use.