At simultaneous reception of Ferroplex with antacid preparations; colestyramine, methyldopa; preparations containing zinc, magnesium, calcium, phosphorus, aluminum; tetracycline antibiotics, chloramphenicol, penicillamine, ciprofloxacin, norfloxacin, ofloxacin, iron absorption deteriorates.
Simultaneous reception of levothyroxine sodium with ferrous sulfate can lead to the formation of an insoluble iron-thyroxine compound, which reduces the absorption of thyroxin. Therefore, patients with primary hypothyroidism who receive levothyroxine sodium, should take levothyroxine sodium and iron with an interval of at least 2 hours, and the function of the thyroid gland should be checked regularly. Do not administer together with other iron preparations, including for parenteral use, to avoid overdose.