What Is Levothyroxine Used For?
Levothyroxine replaces or supplements the thyroid hormone (T4) that your thyroid gland cannot produce in sufficient quantities. Proper thyroid levels are essential for metabolism, energy, brain function, and heart health.
Important safety information
This page is educational only and is not medical advice. All medications can cause side effects and interact with other treatments. Do not start, stop, or change how you take any medication without speaking to a licensed provider or pharmacist. If you experience chest pain, trouble breathing, severe swelling, signs of an allergic reaction, or any other emergency symptoms, call 911 or go to the nearest emergency room.
Emergency: If you are having a medical emergency, call 911 or go to the nearest emergency room. Do not use this site for emergencies or for anything that needs immediate, in-person care.
For specific questions about dosing or interactions, speak with a licensed provider or your pharmacist.