Liotrix
Thyrolar is a brand-name thyroid hormone replacement medication that combines levothyroxine (T4) and liothyronine (T3). It is primarily used to treat hypothyroidism and other thyroid disorders by supplementing deficient thyroid hormones in the body. This combination therapy provides both major thyroid hormones to help restore normal metabolic function.
Thyrolar is a thyroid hormone replacement medication combining T4 and T3 used to treat underactive thyroid conditions.
Key facts at a glance
- RxNorm
- 57213
- Generic
- Thyrolar
- 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.
Thyrolar is used to treat hypothyroidism (underactive thyroid), thyroid cancer, goiter, and other conditions where the thyroid gland does not produce adequate hormones. It may also be used in thyroid function tests to help diagnose certain conditions.
Thyrolar works by replacing the thyroid hormones T3 (liothyronine) and T4 (levothyroxine) that the body is not producing in sufficient quantities. These hormones are essential for metabolism, energy regulation, and normal growth and development.
Thyrolar should not be used to treat obesity or weight problems. It must be taken exactly as prescribed, typically on an empty stomach. Dosage must be carefully individualized, and regular thyroid function monitoring is essential. Patients should not switch brands without medical advice as different formulations may affect hormone levels differently.
Official drug label
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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 9, 2026. · Read our editorial policy