Miaki,
Could you give us some data please? Your current body weight, your L1 dosage (in gms/mg), your Desferal dosage, your current ferritin level, and what it went up to?
L1 has a greater affinity to bind with iron molecules in organs, like your heart or liver, rather than iron molecules in the blood stream. Hence, if your ferritin was high, and you reduced your desferal dosage, it is *possible* for your ferritin levels to creep up, all other things being equal.
However, this is no reason to panic ...... because, you want the organ iron to be chelated first as that is the most toxic. Once organ iron comes down, L1 starts removing iron from the blood stream, too.
Hope that helps,
Poirot