** MedAdvisor drops as much as 24.1% to A$0.205, lowest since Oct. 31

** Medical software co sees group's H1 FY25 rev 25%-30% below the record $75.5 mln in 1H FY24 on lower-than-expected vaccination rates

** Stock posts biggest intraday pct fall since Oct. 31

** Around 1.1 mln shares traded vs the 30-day avg of 614,572

** Stock rises 25.6% this year, as of last close

(Reporting by Nichiket Sunil in Bengaluru)

((Nichiket.Sunil@thomsonreuters.com))