The ASCO guidelines recommend a parenteral mesna dose of 20% of the ifosfamide dose given at zero, 4, and 8 hours after ifosfamide (for a total mesna dose of 60% of the ifosfamide dose). https://www.ktgh.com.tw/Medicament_tbDrug_Look.asp?CatID=12&ModuleType=&NewsID=709&Ordid=30804