Iodine deficiency increases the response of the thyroid to thiamazole, whereas iodine excess lowers the response. Further direct interactions with other medicinal products are not known. However, it should be taken into account that the metabolism and elimination of other medicinal products can be accelerated in hyperthyroidism. They normalize in correlation with increasing normalization of the thyroid function. The dosage must be adjusted where necessary.
Furthermore, there are signs indicating that improvement of hyperthyroidism may normalize the enhanced activity of anticoagulants in hyperthyroid patients.