Is there an underactive thyroid medication that does not have hair loss as a side-effect?

Some underactive thyroid medications (levothyroxine, liothyronine, and liotrix) can cause hair loss as a side-effect. However, there is some evidence that another medication called desiccated thyroid extract (DTE) may be less likely to cause this side-effect. DTE is a natural form of thyroid hormone that is derived from the thyroid glands of animals. It is important to talk to your doctor about which underactive thyroid medication is right for you, as the best medication will depend on your individual needs and medical history.