Final answer:
Synthroid, Levoxyl, Unithroid, and Tirosint are medications used in the treatment of hypothyroidism by providing synthetic thyroid hormones.
Step-by-step explanation:
The medications Synthroid, Levoxyl, Unithroid, and Tirosint are all used for the treatment of hypothyroidism, a condition where the thyroid gland does not produce enough thyroxine hormones. These medications contain synthetic thyroid hormones, such as levothyroxine sodium, which provide the body with the necessary levels of thyroxine.