Dear Anna,
Exjade and L1 each have their set of possible side effects, therefore anyone taking them should be carefully monitored. Many small children are taking exjade without any issues. My 10 year old son takes exjade and he has not had any problems with it so far (thank god).
I think that the suitability for each patient may be different. L1, if it has side effects, are usually related to lowered white blood cell counts, swelling in joints etc. Exjade's possible side effects are related to liver and kidneys (effects reverse once medication is stopped). But not everyone suffers the side effects therefore just be sure to monitor her regardless of which chelator she uses. I don't know if L1 is available for use in North America - exjade is more widely available. When I asked docs in Oakland about which chelator is better they said that they felt safer using exjade for my son. Desferal is another chelator that is widely used, it is probably the most well understood chelator as it has been used for almost 40 years now. Desferal requires placing a needle underneath the skin, usually on the belly, arms or thighs - the needle is attached to a pump that infuses desferal for 10 - 12 hours 5 - 7 nights a week.
I hope that this helps, best of luck to your mom and I hope that the iron is quickly chelated from her body.
Sharmin