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Critical variables associated with nonbiodegradable osmotically controlled implants.

Jeremy C Wright1

  • 1DURECT Corporation, 2 Results Way, Cupertino, California 95014, USA. jeremy.wright@durect.com

The AAPS Journal
|May 22, 2010
PubMed
Summary
This summary is machine-generated.

Osmotically controlled implants provide accurate, long-term drug delivery. A new testing method ensures over 70% drug release for extended-duration implants like DUROS Viadur.

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Area of Science:

  • Pharmacology
  • Biomedical Engineering
  • Drug Delivery Systems

Background:

  • Osmotically controlled implants offer precise zero-order drug release kinetics for extended durations (weeks to years).
  • These systems demonstrate reliable in vivo/in vitro correlation, making them suitable for various therapeutic applications.
  • Accurate release rate testing is crucial for validating implant performance, especially for long-term delivery.

Purpose of the Study:

  • To review critical variables in osmotically controlled implants, focusing on release rate testing challenges.
  • To describe an innovative testing scheme for ensuring greater than 70% cumulative drug delivery.
  • To validate this scheme for the DUROS Viadur (leuprolide acetate) implant.

Main Methods:

  • Review of critical variables affecting osmotically controlled implant performance.
  • Development of a novel release rate testing scheme based on the implant's operational principles.
  • Application and validation of the scheme for the DUROS Viadur implant to achieve >70% cumulative delivery.

Main Results:

  • Extended-duration kinetics of osmotically controlled implants pose challenges for traditional release rate testing (>70% cumulative delivery).
  • The proposed innovative scheme successfully ensures >70% drug delivery at the target rate and duration.
  • The DUROS Viadur (leuprolide acetate) implant demonstrated successful validation using the new testing methodology.

Conclusions:

  • Osmotically controlled implants are effective for sustained drug delivery, but require specialized testing protocols.
  • The described innovative testing scheme addresses the challenge of verifying high cumulative drug release for extended-duration implants.
  • This method ensures reliable performance assessment for implants like DUROS Viadur, crucial for therapeutic efficacy.