** Shares of London-listed drugmaker Indivior INDV.L fall as much as 4.6% to 906.5p

** Company says its finance chief Ryan Preblick will step down as director as the group makes changes to its board following pressure from No. 2 shareholder Oaktree Capital

** INDV appoints Robert Schriesheim and Joe Ciaffoni as independent non-executive directors

** Says it has agreed to move towards a more standard U.S. system of remuneration for directors following its recent primary listing in New York

** "Fixing Indivior is not going to happen overnight and Oaktree's minor victory might simply be the first step in a complicated repair job" - AJ Bell

** Currently, stock down 3.4%, taking YTD losses to ~23%

(Reporting by Aby Jose Koilparambil in Bengaluru)

((abyjose.koilparambil@thomsonreuters.com))