Levothyroxine (Synthroid, Levoxyl) — Uses, Side Effects & Interactions

Levothyroxine is a medication in the Thyroid Hormone Replacement class, sold under the brand names Synthroid and Levoxyl. It is one of the most commonly prescribed medications in the United States. Below you'll find key information about its uses, side effects, and important drug interactions.

What Is Levothyroxine Used For?

Levothyroxine is prescribed to treat the following conditions:

• Thyroid Disorder (Hypothyroidism / Hyperthyroidism)

Your doctor may also prescribe levothyroxine for other conditions not listed here. Always take this medication exactly as prescribed and discuss any questions with your healthcare provider.

Common Side Effects

Most people taking levothyroxine may experience some of the following side effects, which are generally mild and may improve as your body adjusts:

• weight changes
• hair loss (temporary)
• headache
• insomnia

Drug Interactions

Levothyroxine can interact with other medications and substances, potentially changing how the drug works or increasing the risk of side effects. Important interactions include:

• calcium supplements
• iron supplements
• antacids

Always inform your doctor and pharmacist about all medications, supplements, and herbal products you are taking. GProv's AI health navigator, Appi, can help you check for potential drug interactions.

Important Safety Information

This page provides general educational information about levothyroxine and is not a substitute for professional medical advice. Do not start, stop, or change the dosage of any medication without consulting your healthcare provider. If you have questions about whether levothyroxine is right for you, speak with your doctor or pharmacist.