亚砷酸注射液的极量是多少？

毒性药品规定，每次处方不超过２日极量，手边及网上找不到关于亚砷酸注射液极量的资料．

读其说明书，好象这个药还是比较安全的，没有出现过急性中毒病例，如何理解这句话．

请坛内各位专家指导一下，谢谢！

TRISENOX (arsenic trioxide) injection, solution

Dosing Regimen
TRISENOX is recommended to be given according to the following schedule:

Induction Treatment Schedule: TRISENOX should be administered intravenously at a dose of 0.15 mg/kg daily until bone marrow remission. Total induction dose should not exceed 60 doses.

Consolidation Treatment Schedule: Consolidation treatment should begin 3 to 6 weeks after completion of induction therapy. TRISENOX should be administered intravenously at a dose of 0.15 mg/kg daily for 25 doses over a period up to 5 weeks.

三氧化二砷食入的致死量為1-2.5mg/kg