Not reported in the public reviews. Reviewers summarise selectively, so this usually means it wasn't discussed publicly, not that it wasn't studied.
Biodistribution & persistence
Widespread tissue distribution in rat, highest in GI wall, kidney and liver
“Following administration of a single oral dose of 14C-trofinetide (200 mg/kg) to male Sprague Dawley rats, tissue distribution of radioactivity was widespread, with the highest concentrations in gastrointestinal tissue (small and large intestine wall), kidney, and liver;”
✓ VerifiedFDA pharmacology/toxicology review, p. 3Source ↗
Modality-specific risk
Limited exposure margins: soft feces at the high dose, with animal exposures below human exposure
“The only notable finding was an increase in watery or soft feces at the highest dose tested, which was associated with plasma exposures (AUC) less than those in pediatric and adult patients at the recommended doses.”
✓ VerifiedFDA pharmacology/toxicology review, p. 4Source ↗