Levothyroxine Sodium

Medically Reviewed by Dr. Harshi Dhingra, M.D.

Last Reviewed: May 14, 2025

Drug Details


Common Brands:

Synthroid, Levo-T, Levoxyl, Unithroid, Tirosint

Availability:

Prescription only

Therapeutic Class:

Thyroid hormone replacement therapy

Forms:

Tablet, injection solution

Administration:

By mouth, by intravenous injection

Therapeutic Uses:

  • Hypothyroidism
  • Thyroid cancer

Controlled Status:

Not a controlled substance


Levothyroxine Drug Class

Levothyroxine (lee-voe-thai-rox-een) is a synthetic form of the thyroid hormone thyroxine (T4) that is naturally made in the body.

Levothyroxine Age Range

Levothyroxine is approved for use in adults and children, including infants and newborn babies.