Helllo Micky,
I used to take exjade. I was on it for about 2 years before I stopped taking it and switched back to desferal. When i took Exjade, my side effects were nausea and diarrhea. Instead of going to the bathroom, once a day, I had to go to the bathroom almost every time I ate without fail. If I didn't take my Exjade one day, then I didn't have any problems. But every day that I took Exjade, I would have to go to the bathroom right after eating, and I never wanted to eat because I always felt like I was going to vomit. I took it for two years while in high school, but when I started college, it started becoming difficult because I would have to worry about finding a bathroom whenever I ate on campus and I would be consistently late to classes.
Thals are generally on the small and slender size, but if your son is even more thin then a normal thal then the extra motions every day is most likely what is causing your son to remain thin. Taking the derolac/norflox to treat the diarrhea is a good method, but you should ask your doctor because using antidiarrhetics for long periods isnt healthy.
I know splitting the dose has worked for many, but it did not work for me. Maybe you should try it and see if it helps!
Archana