Is hair loss usual while taking coumadin (warfarin)?

Not usual : Is not a common side effect, however has been reported.

Hair loss w Coumadin (warfarin): While it is not a common complic, some on Coumadin (warfarin) do report problems w hair loss. It is not clear that the Coumadin (warfarin) itself is the cause of the hair loss as many patients taking Coumadin (warfarin) have nutritional issues, cross reacting medications and other causes for hair loss.