Thrombocythemia is clotting disorder

Dear Dr. Roach: I’m an 88-year-old woman whose platelets went into the 500,000 range. I was sent to a hematologist/oncologist, who said it was a bone marrow disease. I was put on hydroxyurea 500 mg. A couple of months later, a blood test showed enlarged red blood cells, which I understand is from the hydroxyurea, but my doctor says it also prevents blood clots and strokes. However, in July I got a blood clot in my leg, and I am now on Xarelto for life. My question is if you think I could get additional clots from hydroxyurea, and if this is the best treatment. —…