I participated in the study of this drug before it was made available, and they took note of everything I experienced during that time, even things mostly likely not related to taking the drug, or obviously caused by the disease and not the drug (diarrhea? duh), all which ends up listed as side effects. So take the list with a grain of salt.
I have tons of thick hair and don't think I have any side effects (but after 20 years, what would normal feel like?). I know it worked remarkably well and saved me from surgery back in the 1980's.
49 year old female, diagnosed UC/pancolitis 1985, no surgery but much suffering.
Asacol/5ASA maintenance for 20+ years, usually 3 pills 2x day.
Currently tapering off presnisone from lingering flare;
August 2008 sought care of naturopathic doctor. Tested gluten intolerant and started gluten-free, soy-free, etc. diet which resolved flare. Also Replete probiotic, DGL (licorice root, slippery elm), Permeability Factors. Slow-release iron and B-12 shots for severe anemia.