Rat QWBA: not measurable in CNS or lens; prolonged uveal tract and pigmented skin retention (melanin affinity)
“Radioactivity concentrations were below measurable levels in the CNS tissues and the lens of the eye at all collection times throughout the study. Radioactivity was present in the uveal tract through 192 hours postdose and a slower clearance in pigmented skin indicating an apparent affinity for melanin.”
Embryofetal toxicity (teratogenicity) without exposure margin to the clinical dose
“Upadacitinib is a potent teratogen in rats and rabbits, with NOAELs in these studies associated with exposes similar to or less than the proposed clinical dose.”
✓ VerifiedFDA pharmacology/toxicology review, p. 6Source ↗