Splenic germinal center development in 1- and 3-month rat studies, a response to weak antigenic stimulation; no anaphylaxis
“In the 1-month and 3-month repeat-dose toxicity studies in rats, development of germinal centers in the spleen, which suggested an enhanced antibody production, was observed. This change is considered to be an immune response possibly associated with the weak antigenic stimulation by cefiderocol, however, there was no evidence of anaphylaxis in either study.”
✓ VerifiedFDA multi-discipline review, p. 142Source ↗
“CNS exposure was low and brief. Most tissue levels were lower than plasma levels. Binding to RBC was negligible. Preferential binding to melanin not observed.”
✓ VerifiedFDA multi-discipline review, p. 50Source ↗
Modality-specific risk
Convulsions (rat) and QTc prolongation (monkey), at exposures >18-20-fold human Cmax
“Convulsions observed in rats occurred at blood levels >20-fold higher and QTc prolongation in monkeys occurred at blood levels >18-fold higher than the Cmax in healthy male volunteers.”
✓ VerifiedFDA multi-discipline review, p. 48Source ↗