** Drug developer Biohaven's shares fall 12.9% to $46.24
** Company provides update on ongoing early stage study of its experimental inflammatory disease drug called BHV-1300
** TD Cowen analyst Tyler Van Buren says the drug's starting dose of 10 milligrams is lower than anticipated
** Higher doses than what is being tested in first two cohorts will be required to achieve reductions of 70% or higher in levels of disease causing antibodies called IgG - Buren
** Drug showed IgG reductions of about 80%, seen about two days after a single dose, company says
** BTIG analyst Thomas Shrader says most troublesome issue with BHV-1300 is 5 gram to 20 gram equivalent doses
** "If these doses are required going forward, toxicity readouts will be of great interest" - Shrader
** Drug is safe and well tolerated with no serious adverse events reported, company says
** Including session moves, stock up 5% YTD
(Reporting by Sneha S K in Bengaluru)
((Sneha.SK@thomsonreuters.com;))
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