Armour® Thyroid Tablets

(Commercial Product)

Available Dosage Strengths

1/4 grain – 4 grain

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Disclaimer: Images are for reference only; actual products may vary.

Product Overview

Armour® Thyroid Tablets Description1,2

Armour Thyroid (thyroid tablets, USP for oral use is a desiccated thyroid extract that is derived from porcine thyroid glands. (T3 liothyronine is approximately four times as potent as T4 levothyroxine on a microgram for microgram basis.) It provides 38 mcg levothyroxine (T4) and 9 mcg liothyronine (T3) per grain of thyroid.1 It is used for the treatment of hypothyroidism of any etiology, and for the treatment or prevention of various types of euthyroid goiter.

Mechanism of Action1,2

Thyroid hormones influence the growth and maturation of tissues, increase energy expenditure, and affect the turnover of essentially all substrates. These effects are mediated through control of DNA transcription and, ultimately, protein synthesis. Thyroid hormones play an integral role in both anabolic and catabolic processes and are particularly important to the development of the central nervous system in newborns. They regulate cell differentiation and proliferation, and aid in the myelination of nerves and the development of axonal and dendritic processes in the nervous system. Thyroid hormones, along with somatotropin, are responsible for regulating growth, particularly of bones and teeth.

Signs and symptoms of overdosage1,2

  • Anorexia, nausea, vomiting
  • Palpitations, tachycardia
  • Nervousness, tremors
  • Insomnia, irritability
  • Weight loss
  • Heat intolerance
  • Menstrual irregularities

Contraindications & Precautions1,2

  • Hypersensitivity to any component of the formulation.
  • Use with caution in patients with cardiovascular disease (e.g., angina, arrhythmias).
  • Caution in patients with diabetes mellitus as thyroid hormone can alter glycemic control.
  • Start at lower doses in elderly individuals and titrate slowly.
  • Long-term use may accelerate bone loss, especially in postmenopausal women.
  • Store at controlled room temperature (20°C to 25°C / 68°F to 77°F)
  • Protect from moisture and light
  • Keep in a tightly closed container
  1. Armour Thyroid Prescribing Information. RxAbbVie. Revised March 2024. Accessed June 2, 2025. https://www.rxabbvie.com/pdf/armour_thyroid_pi.pdf
  2. Clinical Pharmacology Armour thyroid clinical monograph 2025 https://www.clinicalkey.com/pharmacology/

Wells Pharmacy Network is a 503B-registered outsourcing facility that compounds sterile medications in accordance with current good manufacturing practices (cGMP). Certain FDA-approved products referenced on this site are distributed separately from compounded preparations and are not manufactured by Wells Pharmacy Network. Actual products in stock at time of dispensing may vary due to supply chain variability.

This information may not cover all possible drug information about this product. Call your doctor for medical advice and/or about side effects. You may report side effects to the FDA at 1-800-FDA-1088.  A Wells Pharmacy Network pharmacist will be happy to answer any questions. For consultation, please call 1-800-622-4510.

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