Reaction

Idiosyncratic Drug Reaction reporting signals

Last recalculated 2026-09-14T18:28:35.993900+00:00 · 972 reports · 10 co-occurring drugs

As of the last recalculation, Idiosyncratic Drug Reaction appears in 972 FAERS reports alongside 10 co-occurring drug terms. The strongest observed disproportionality signal is OSELTAMIVIR (PRR 38.2).

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.
DrugCo-reportsPRRROR
Oseltamivir1438.238.3
Phenytoin3132.832.9
Metronidazole Topical4119.219.2
Ampicillin718.218.2
Ampicillin Sodium718.218.2
Cenobamate615.515.5
Valproic Acid2114.614.6
Thiotepa613.513.5
Oseltamivir Phosphate1412.412.4
Bleomycin Sulfate510.410.4

Related reactions

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