Slideshows Images Quizzes

Copyright © 2018 by RxList Inc. RxList does not provide medical advice, diagnosis or treatment. See additional information.

Definition of Levothyroxine

Levothyroxine: A synthetic thyroid hormone used as a thyroid hormone replacement drug (brand names include Levothroid, Levoxine, Levoxyl, Synthroid) used to treat an underactive thyroid gland (hypothyroidism).

Health Solutions From Our Sponsors