Title: Application of Modern Drug Metabolism Structure Determination Tools and Assays to the In Vitro Metabolism of Imiloxan
Volume: 4
Issue: 2
Author(s): William L. Fitch, Yuan Chen, Liling Liu, Axel Paehler and May Young
Affiliation:
Keywords:
Imiloxan, metabolism, mass spectrometry, reactive metabolite
Abstract: Imiloxan is an alpha2 adrenoceptor antagonist and was developed for depression in the 1980s. In Phase 1 clinical trials imiloxan dosing led to hypersensitivity reactions; the molecules development was discontinued. The present study revisits the in vitro metabolism of imiloxan using modern analytical methods. Human and rat liver microsomes convert imiloxan into a variety of metabolites many of which are unstable and or reactive. Imiloxan also yields high protein covalent binding in microsomal assays. Imiloxan is a useful test molecule for defining the relationship between liver covalent binding and idiosyncratic toxicity.
