At physiological pH, ferric-ATP complex presents ionic characteristics
unlike those of ferric lactate. Its rapid diffusion into the tissues,
and its reactivity which is not impaired by polymerization seem respo
nsible for its toxicity. In comparison with ferric lactate, after pare
nteral administration there is a much higher spleen, lung, kidney and
bone accumulation. After oral administration, on the other hand, the v
alues are lower. ATP hydrolysis by the stomach's pH, and the subsequen
t iron insolubilisation as phosphate could be the reason for this beha
viour.