When administered parenterally as an addition to infusion solutions, it must be ensured that no non-specific precipitation occurs. It is important to ensure that the pH value does not fall below 7.0 and that no mixture is mixed with reducing agents such as Vitamin C occurs since precipitation of elemental selenium cannot be ruled out. Elemental selenium is insoluble and not bioavailable in aqueous medium. For safety reasons, non-specific precipitation should be avoided after mixing the infusion solution with Selesyn 100 micrograms.