Reaction

Anti Factor Viii Antibody Positive reporting signals

Last recalculated 2026-09-14T18:28:35.993900+00:00 · 558 reports · 1 co-occurring drugs

As of the last recalculation, Anti Factor Viii Antibody Positive appears in 558 FAERS reports alongside 1 co-occurring drug terms. The strongest observed disproportionality signal is EMICIZUMAB (PRR 109.2).

Important: FAERS is a spontaneous, voluntary, unverified reporting system. PRR and ROR identify reporting patterns for investigation; they are not incidence rates and do not establish causation.

Drug	Co-reports	PRR	ROR
Emicizumab	34	109.2	109.5

Related reactions

Drug Ineffective
Off Label Use
Death
Nausea
Fatigue

Data source: openFDA FAERS. See the OpenPV methodology and limitations.