When taking Asacol in 2011, I had really bad hair loss. It improved a little when I decreased my dosage. Because of this problem, my GI had me switch to Lialda. I didn't notice much difference though, maybe slight... After dealing with this side effect for about
a year, I stopped oral mesalamine. I was feeling better at that time with UC symptoms, but the hair loss was really too much to handle. After I stopped the medication, hair loss stopped after approximately 2 to 3 weeks. I don't recommend however that you stop your medication.
Have you tried biotin supplements? I was taking biotin while on Lialda. Even though I started taking it closer to the time when I discontinued my medication, I do think it helped. My hair came back thicker!
Right now I'm back on Lialda, and hair is falling out again
What a horrible disease