This glossary reflects terms found in the Armour Thyroid Full Prescribing Information.

Diabetes insipidus — marked by great thirst and the passage of large amounts of urine; not related to abnormal blood sugar metabolism

Diabetes mellitus — the most common form of diabetes, caused by inadequate insulin secretion or utilization

Hyperthyroidism — excess production of thyroid hormone due to abnormal thyroid gland function, most commonly due to stimulation by the immune system or due to a nodule

Hypothyroidism — deficiency of thyroid activity

Levothyroxine sodium (T4) — a hormone medication taken by mouth for replacement therapy in patients with reduced or absent thyroid function

Liothyronine — the synthetic form of the thyroid hormone triiodothyronine (T3), which is more potent and has a more rapid action than thyroxine

Myxedema —a condition characterized by swelling and hardening of the skin and other soft tissues, particularly around the eyes and cheeks, caused by extreme deficiency of thyroid hormone

Thyrotoxicosis — a toxic condition resulting from excessive amounts of thyroid hormones in the body; what occurs in hyperthyroidism

Thyroxine — an iodine-containing hormone produced by the thyroid gland to regulate metabolism; also made synthetically for treatment of thyroid disorders

TSH — also called thyroid-stimulating hormone. Normally TSH tells your thyroid gland to produce hormone. A TSH blood test is used to determine how the thyroid gland is working

Other Terms

Endocrinologist — a doctor who specializes in treating patients with endocrine or hormonal problems, including thyroid disease and diabetes

L-triiodothyronine (T3) — a key thyroid hormone that is made from T4 and is the more biologically active hormone

Important Safety Information Thyroid hormone should be used with caution in patients with angina pectoris or the elderly, in whom there is a greater likelihood of occult cardiac disease. In these patients, therapy should be initiated with low doses, i.e., 15-30 mg Armour Thyroid. The development of chest pain or other exacerbation of cardiovascular symptoms will require a decrease in dosage. Thyroid hormone may increase symptoms of diabetes mellitus, diabetes insipidus, or cortical insufficiency. Appropriate adjustments of the various therapeutic measures directed at these concomitant endocrine diseases are required. Dosages of oral anticoagulants should be adjusted in thyroid-treated patients on the basis of frequent prothrombin time determinations. Caution should be used in infants where excessive doses of thyroid hormone preparations may produce craniosynostosis.