Hi Syaida,
Exjade is much easier to administer than desferal, so it has become the drug of preference these days. Its actions are fairly equivalent to desferal and it requires no needles, so most doctors are now leaning towards Exjade for early use. I'm not sure I would want to go through the hassle of trying a needle on a young boy. When he does start Exjade, whether now or later, start with a low dose and build up to the required dosage, as his body gets used to the drug. This will eliminate most of the early side effects, like the rash. Get him used to drinking tea also, as this helps inhibit iron absorption and is a natural chelator.
Which chelator is best? Every company will argue for their drug, but studies have shown that Ferrirprox (L1, deferiprone, Kelfer) is best at removing heart iron and also offers a cardio-protective benefit, that the other chelators do not. Why is this most important? Because heart failure is the number one cause of death in thalassemics. In addition, after over 20 years of use, no further side effects for L1 have been found. The drop in white cells in some patients is long established as the main detrimental side effect of L1. Joint pain is the other side effect most often mentioned. Compared to the other chelators, L1 is the superior drug. I would also be a bit reluctant to start a young child on L1, but by age 6, it should be considered, depending on how well the boy is doing with his current chelation regimen.
I also want to mention for all, that most doctors agree that patients should not rely on only one chelator during their lifetime, as switching chelators can help to minimize any long term effects.