FDA label

What is Synthroid used for?

Synthroid contains levothyroxine. The FDA-approved uses below are quoted from the Indications and Usage section of its DailyMed label.

Source: DailyMed SPL label file dated 2026-10-23. Publisher page

The FDA label says: “Hypothyroidism”

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Synthroid, tablet

Indications and Usage, quoted from the label by AbbVie Inc. (NDA021402). Cross-references to other label sections are left out.

Hypothyroidism
SYNTHROID is indicated in adult and pediatric patients, including neonates, as a replacement therapy in primary (thyroidal), secondary (pituitary), and tertiary (hypothalamic) congenital or acquired hypothyroidism.
Pituitary Thyrotropin (Thyroid -Stimulating Hormone, TSH) Suppression
SYNTHROID is indicated in adult and pediatric patients, including neonates, as an adjunct to surgery and radioiodine therapy in the management of thyrotropin-dependent well-differentiated thyroid cancer.
Limitations of Use
SYNTHROID is not indicated for suppression of benign thyroid nodules and nontoxic diffuse goiter in iodine-sufficient patients as there are no clinical benefits and overtreatment with SYNTHROID may induce hyperthyroidism.
SYNTHROID is not indicated for treatment of hypothyroidism during the recovery phase of subacute thyroiditis.

Source: DailyMed label, set id 1e11ad30-1041-4520-10b0-8f9d30d30fcc, version 1537, effective February 20, 2024. NDC 0074-3727, one of 12 listings for this product.