[Infusion-related reactions with human polyclonal immunoglobulins: Analysis from the French National Pharmacovigilance Database].

Objectives: Infusion-related reactions to immunoglobulins are well documented. The objective of this study was to characterize these reactions using real-world data to provide clinically relevant information.

Methods: This descriptive study analyzed cases of infusion-related reactions reported in the French National Pharmacovigilance Database for immunoglobulins administered via intravenous or subcutaneous routes up to December 27, 2023.

Results: During the study period, 239 cases of infusion-related reactions were reported, primarily associated with intravenous immunoglobulins (97.4%). In over half of the cases (51%), the reactions presented as flu-like syndromes. These reactions typically occurred during the first cycle for IV immunoglobulins and the fourth cycle for SC immunoglobulins. Following the onset of an infusion-related reaction, the infusion was most commonly discontinued (87.7%) or the infusion rate reduced (9.1%). In 64 cases, resolution of the reaction allowed the continuation of treatment with reduced infusion rates (65%), premedication (28%), or both (7%). Resumption of the infusion did not lead to recurrence in 60% of cases. For subsequent cycles, administration of the same formulation (n=100) resulted in recurrence in 40% of cases, while switching to a different formulation (n=16) was associated with recurrence in 75% of cases.

Conclusion: Infusion-related reactions to immunoglobulins most frequently present as flu-like syndromes or cardiovascular disturbances, which are typically resolved by reducing the infusion rate or discontinuing the infusion. Resumption of the infusion is feasible following resolution, using a reduced rate or premedication. The findings suggest that switching to a different formulation of the same administration route does not confer a practical advantage.