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
Rat: absorbed iron bound to transferrin; after IV dosing, highest iron levels in liver and bone marrow, protein-bound
“Radiolabeled iron from ferric maltol in the rat intraduodenal administration studies was found bound to transferrin with a time to half maximal concentration (T½) of 133 minutes. Ferric maltol as single 1000 µg or 1 mg IV doses of iron was administered to rats, resulting in highest iron concentrations in the liver and bone marrow, with the iron being bound to proteins.”
✓ VerifiedFDA multi-discipline review, p. 27Source ↗
Modality-specific risk
Mutagenicity of ferric maltol and maltol in Ames assays
“Ferric maltol was mutagenic in vitro in bacterial reverse mutation (Ames) assays.”
✓ VerifiedFDA multi-discipline review, p. 28Source ↗