Combined toxicity of Na <sub>2</sub>EDTA and D <sub>2</sub>O
Physicochemical and biopharmaceutical analysis of excipients doesn’t allow to characterize them as inert components of drug products. Excipients are known to exhibit their own biological activity as well as influence the activity of API and other components of the formulation (antioxidants, stabilizers, fillers, etc.). Combined biological activity of stabilizer/antioxidant — disodium ethylenediaminetetraacetate (Na <sub>2</sub>EDTA) — and water with different ratios of hydrogen isotopes (D / H) was studied on biological models of Spirotox. It was found that with the growth of deuterium/protium ratio in water the toxicity of Na <sub>2</sub>EDTA increased.