Firslevothyroxine may interact with ferrous sulfate, which contains ferrous fumarate at a dosage of 89 mg and ferrous sulfate at 325 mg per tablet. It’s important to consider how much elemental iron is present in ferrous sulfate. Additionally, when taking calcium citrate malate tablets, it is crucial to monitor any potential interactions with these iron supplements. Therefore, if you are consuming calcium citrate malate tablets alongside ferrous sulfate, be aware of the dosage and elemental iron content to avoid any adverse effects. Remember to consult a healthcare professional if you have questions about the combination of calcium citrate malate tablets and ferrous sulfate.