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The AAPS Journal

, 20:105 | Cite as

Reverse Engineering the 1-Month Lupron Depot®

  • Jia Zhou
  • Keiji Hirota
  • Rose Ackermann
  • Jennifer Walker
  • Yan Wang
  • Stephanie Choi
  • Anna Schwendeman
  • Steven P. Schwendeman
Research Article
  • 300 Downloads

Abstract

The 1-month Lupron Depot® (LD) encapsulating water-soluble leuprolide in poly(lactic-co-glycolic acid) (PLGA) microspheres is a benchmark product upon which modern long-acting release products are often compared. Despite expiration of patent coverage, no generic product for the LD has been approved in the USA, likely due to the complexity of components and manufacturing processes involved in the product. Here, we describe the reverse engineering of the LD composition and important product attributes. Specific attributes analyzed for microspheres were as follows: leuprolide content by three methods; gelatin content, type, and molecular weight distribution; PLGA content, lactic acid/glycolic acid ratio, and molecular weight distribution; mannitol content; in vitro drug release; residual solvent and moisture content; particle size distribution and morphology; and glass transition temperature. For the diluent, composition, viscosity, and specific gravity were analyzed. Analyzed contents of the formulation and the determined PLGA characteristics matched well with the official numbers stated in the package insert and those found in literature, respectively. The gelatin was identified as type B consistent with ~ 300 bloom. The 11-μm volume-median microspheres in the LD slowly released the drug in vitro in a zero-order manner after ~ 23% initial burst release. Very low content of residual moisture (< 0.5%) and methylene chloride (< 1 ppm) in the product indicates in-water drying is capable of removing solvents to extremely low levels during manufacturing. The rigorous approach of reverse engineering described here may be useful for development of generic leuprolide-PLGA microspheres as well as other new and generic PLGA microsphere formulations.

KEY WORDS

generic drugs leuprolide Lupron Depot® PLGA microspheres reverse engineering 

Notes

Acknowledgements

We gratefully thank Jason Romberg from Anton Paar USA Inc. who helped with the determination of viscosity of the injection diluent.

Funding

This research was funded by FDA contract HHSF223201510170C A0001 BAA. This paper reflects the views of the authors and should not be construed to represent FDA’s views or policies.

Supplementary material

12248_2018_253_MOESM1_ESM.docx (22 kb)
ESM 1 (DOCX 21 kb)

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Copyright information

© American Association of Pharmaceutical Scientists 2018

Authors and Affiliations

  • Jia Zhou
    • 1
  • Keiji Hirota
    • 1
    • 2
  • Rose Ackermann
    • 1
  • Jennifer Walker
    • 1
  • Yan Wang
    • 3
  • Stephanie Choi
    • 3
  • Anna Schwendeman
    • 1
  • Steven P. Schwendeman
    • 1
    • 4
  1. 1.Department of Pharmaceutical Sciences, The Biointerfaces InstituteUniversity of MichiganAnn ArborUSA
  2. 2.Production Engineering DepartmentChugai Pharmaceutical Co., Ltd.TokyoJapan
  3. 3.Office of Generic Drugs, U.S. Food and Drug AdministrationSilver SpringUSA
  4. 4.Department of Biomedical EngineeringUniversity of MichiganAnn ArborUSA

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