Looking at the info provided by Lilly:

Preparation and Administration
• The 700 mg dose MUST BE prepared using 0.9% sodium chloride.
• Preparation of 700 mg dose of bamlanivimab for IV infusion*
• Administration of a dose of 700 mg of bamlanivimab in an IV infusion*
• Bamlanivimab solution for infusion should be prepared by a qualified health care professional using aseptic technique.