** Shares of IDT Australia IDT.AX falls as much as 38.9% to A$0.055, their biggest intraday pct loss since December 16, 2021
** The pharma co sees its FY25 net loss after tax to jump to A$7.5 million ($4.88 million), compared to A$5.4 million posted a year ago
** Earnings impact due to bad debt recognition of nearly A$1.2 million
** Co's CEO Paul McDonald resigns, appoints Mark Simar as Executive Chair
** YTD, shares down 30%
($1 = 1.5363 Australian dollars)
(Reporting by Nichiket Sunil in Bengaluru)
((Nichiket.Sunil@thomsonreuters.com))