My mom had a blood clot last year.she was on xeralto but it didnt shrink the clot.she is now on coumadin (warfarin) and her blood is getting thicker. why?

Difficult to adjust: coumadin (warfarin) is difficult to regulate and is affected by diet activity and many drugs. The target specific anticoagulants (TSA) are much easier to manage. Thicker blood means her dosing needs to be adjusted. If the TSA was not effective I wonder if it was dosed and managed appropriately. Discuss this with your health care professional. The science on this is clear.