How long should i take coumadin (warfarin) for a dvt of unknown origin? never had one in the past. current inr is 2.3. been taking it for 60 days.

3 months: But you should have a thorough work up to try to identify the cause.

At least 6 months: According the american college of chest physicians an unprovoked [ no clear precipitating event ] should be treated for 6 months.[ or 180 days]. Further work up may uncover reasons to treat longer. Please understand that too short of treatment increases the risks for additional blood clots.