If you are currently being treated with any of the following medications, you should not use iodine supplements without first talking to your health care provider:

Antithyroid Drugs -- Use of antithyroid drugs, including propylthiouracil (PTU), and iodide may potentiate the hypothyroid effect of iodides.

Lithium -- Use of potassium iodide and lithium (Lithobid®) may result in hypothyroidism.

Warfarin -- Use of potassium iodide (for hyperthyroidism) and warfarin (Coumadin®, a blood thinning drug) may decrease the anticoagulant effectiveness of warfarin.