Do not take thyroxine tablets with mineral water. calcium (Ca2+), magnesium (Mg2+) and iron (Fe2+/3+) are found in mineral water with a high calcium content, effervescent tablets, sports drinks, dietary supplements and osteoporosis medications.
To avoid interactions, there should be an interval of at least two or, better, four hours between taking Thyroxine and the minerals. It is safest if, for example, you swallow thyroxin in the morning and preparations such as iron and zinc capsules in the evening.