It’s a bit unfair to ask the parent to do this legwork. The fact that it got approved implies that it is effective and that side effects are rare and/or relatively minor.

Edit:

From the phase II trial:

“ Adverse events overall were similar between groups, with the exception of bleeding, which occurred more often with the immunoglobulin treatment (54% versus 38%). The two participants who died were both in the placebo group.” https://www.medpagetoday.com/Cardiology/VenousThrombosis/561...