IV:

Infants, Children, and Adolescents: 50 mg/kg/dose as a single dose maximum: 2,000 mg/dose (Becker 2019).

Inhalation:

MgSO4 10% is hypertonic, and to convert it to isotonic, it must be diluted with SWI by the ratio 1:1 before administration via neubulizatio

For Asthma, acute refractory exacerbation, age > 2 years the dose is 150 mg (1.5 ml) + 1.5 ml SWI every 20 min. for 3 doses. (GINA 2020; Powell 2013).