Levothyroxine is a thyroid medicine that replaces a hormone normally produced by the thyroid gland to regulate the body’s energy and metabolism. Doctors usually use it to treat hypothyroidism (an underactive thyroid gland). Doctors sometimes use it to treat excessive daytime sleepiness (EDS).

Brand names include Euthyrox, Levo-T, Levothroid, Levoxyl, Synthroid, Thyquidity, Tirosint, and Unithroid.

thyroid supplement
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