Hi VS,
First of all start with a small dose,so that body will have time adjusting with the drug,can you tell us whats your child's weight and how much is the ferritin?
Things that are needed to monitor while on desirox are,
Liver function ( SGPT)
Renal function (Serum Creatinine)
These are very important levels to be monitored as desirox can effect them sometimes,give him plenty of fluids,avoid giving any calcium supplement before or after three hours of taking desirox.always use plastic cup and spoon to disperse the tablet ,never use any metal cup or spoon.
Hope this helps.
Zaini.