Levothyroxine is a replacement for a hormone normally produced by your thyroid gland to regulate the body's energy and metabolism. Levothyroxine is given when the thyroid does not produce enough of this hormone on its own. Levothyroxine treats hypothyroidism (low thyroid hormone). Levothyroxine is also used to treat or prevent goiter (enlarged thyroid gland), which can be caused by hormone imbalances, radiation treatment, surgery, or cancer. Levothyroxine may also be used for purposes not listed in this medication guide.
Unithroid is a synthetically made thyroid hormone that treats hyperthyroidism. Unithroid belongs to a drug class thyroid drugs, and it is available in generic form as levothyroxine. It mediates thyroid deficiency symptoms like hair loss, weight gain, feeling cold and energy loss. Unithroid also treats or prevents goiter that can lead to hormonal imbalances or cancer.