Answer
They are neutralising antibodies that reduce the treatment's effect. Unexpected or persistent bleeding should be assessed by the haemophilia centre.
Sources for this answer
- Refixia 500 IU powder and solvent for solution for injection — Current selected SmPCemc · Summary of Product Characteristics
- NHSNHS · NHS medicine guidance
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.