The AAPS Journal

, Volume 18, Issue 4, pp 886–897 | Cite as

Use of Modeling and Simulation Tools for Understanding the Impact of Formulation on the Absorption of a Low Solubility Compound: Ciprofloxacin

  • Marilyn Martinez
  • Bipin Mistry
  • Viera Lukacova
  • Jim Polli
  • Stephen Hoag
  • Thomas Dowling
  • Ravikanth Kona
  • Raafat Fahmy
Research Article Theme: Revisiting IVIVC (In Vitro-In Vivo Correlation)
Part of the following topical collections:
  1. Theme: Revisiting IVIVC (In Vitro-In Vivo Correlation)

Abstract

This study explored the utility of mechanistic absorption models to describe the in vivo performance of a low solubility/low permeability compound in normal healthy subjects. Sixteen healthy human volunteers received three oral formulations and an intravenous infusion in a randomized crossover design. Plasma ciprofloxacin concentrations were estimated by HPLC. In vitro ciprofloxacin release from the oral tablets was tested under a variety of conditions. A mechanistic model was used to explore in vivo dissolution and intestinal absorption. Although dissolution rate influenced the location of drug release, absorption challenges appeared to be associated with permeability limitations in the lower small intestine and colon. The apparent relationship between drug solubilization within the upper small intestinal and formulation overall bioavailability suggested the presence of an intestinal absorption window in many individuals. Failure to absorb drug within this window appeared to be linked with the likelihood of in vivo drug precipitation. Challenges encountered during this modeling exercise included large intersubject variability in product in vivo dissolution and the apparent limitations in ciprofloxacin absorption. Although transporter activity was not included as a model parameter, this evaluation demonstrated how identifying the location of drug absorption across several formulations provided an opportunity to identify factors to consider when formulating similar low solubility/low permeability compounds. The use of mechanistic models was invaluable for our understanding of in vivo product performance and for the assessment of individual profiles rather than means. The latter was essential for understanding the potential challenges that may be encountered when introducing a formulation into a patient population.

KEY WORDS

ciprofloxacin IVIVC mechanistic model pharmacokinetics 

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Copyright information

© American Association of Pharmaceutical Scientists 2016

Authors and Affiliations

  • Marilyn Martinez
    • 1
  • Bipin Mistry
    • 1
  • Viera Lukacova
    • 1
  • Jim Polli
    • 1
  • Stephen Hoag
    • 1
  • Thomas Dowling
    • 1
  • Ravikanth Kona
    • 1
  • Raafat Fahmy
    • 1
  1. 1.The Food and Drug AdministrationRockvilleUSA

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