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Drug-induced hypothyroidism may be caused by: 1  Drugs used for hyperthyroidism (overactive thyroid), such as propylthiouracil (PTU), radioactive iodine, potassium iodide, and methimazole. 2  Treatment with lithium or iodides in certain people.
If iodine deficiency isn't the cause of hypothyroidism, then iodine supplements provide no benefit and should not be used. In fact, for some people with abnormal thyroid glands, too much iodine can cause or worsen hypothyroidism.Hypothyroidism can be safely and effectively treated with the synthetic thyroid hormone levothyroxine (Synthroid, Levothroid, others).With.n fact, for some people with abnormal thyroid glands, too much iodine can cause or worsen hypothyroidism. Hypothyroidism can be safely and effectively treated with the synthetic thyroid hormone levothyroxine (Synthroid, Levothroid, others). With.