By what route and over how long is efgartigimod alfa administered as Vyvgart 20 mg/mL concentrate for solution for infusion?

Efgartigimod alfa as Vyvgart 20 mg/mL concentrate for solution for infusion is administered only by intravenous infusion over 1 hour after dilution with sodium chloride 9 mg/mL (0.9%) solution for injection, not by intravenous push or bolus injection.