I am taking Apriso, which is like Pentasa, and my hair loss is still really bad. I have definitely lost more than half of my hair. It is really thin now. I am very upset about it, but I am not interested in bleeding again, so I continue to take the medicine. I am ready to buzz it and get a nice, thick wig. I try to stay positive about it, but it is really depressing. I know in my case, the Apriso makes me anemic and all of my iron markers/hemoglobin are low on my blood tests. I do take a liquid iron supplement, but if I take too much, it bothers my UC. Have you had any blood tests since starting Pentasa?