Thyroid
Unithroid is a brand-name medication containing levothyroxine sodium, a synthetic form of the thyroid hormone thyroxine (T4). It is primarily used as replacement therapy for patients with hypothyroidism (underactive thyroid) who cannot produce adequate thyroid hormone naturally. This medication helps restore normal hormone levels, improving energy metabolism, mental function, and other bodily functions affected by low thyroid activity.
Unithroid is a thyroid hormone replacement medication used to treat hypothyroidism by supplementing the body's natural thyroid hormone levels.
Key facts at a glance
- RxNorm
- 284910
- Generic
- Unithroid
- Class
- brand-name
- Brands
- —
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- —
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Treatment of hypothyroidism (underactive thyroid), including primary, secondary, and tertiary hypothyroidism; management of congenital hypothyroidism; and suppression of TSH in certain thyroid conditions such as thyroid nodules and differentiated thyroid cancer.
Unithroid contains levothyroxine sodium, a synthetic form of thyroxine (T4) that mimics the natural thyroid hormone produced by the thyroid gland. Once absorbed, it is converted to T3 (triiodothyronine), the active form of thyroid hormone, helping to regulate metabolism, energy levels, and various bodily functions.
Should be taken on an empty stomach, typically 30-60 minutes before breakfast. Avoid taking with calcium, iron, antacids, or high-fiber foods as they may reduce absorption. Regular blood tests are needed to monitor thyroid levels and adjust dosage. Do not use for weight loss. Inform your doctor of all medications, as many drugs can interact with levothyroxine.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy