The purpose of treatment is to replace the deficient thyroid hormone. Levothyroxine is the most commonly used medication. The lowest dose effective in normalizing thyroid function is used. Life-long therapy may be necessary. Medication must be continued even when symptoms subside.

After replacement therapy has begun, report any symptoms of increased thyroid activity (hyperthyroidism), such as restlessness, rapid weight loss, and sweating.

A high-fiber, low-calorie diet and moderate activity will help relieve constipation and promote weight loss if weight was gained during the time when thyroid activity was low.

In individuals with accompanying hypoadrenalism, steroid replacement must be instituted before thyroid replacement is begun.

In patients who have hypothyroidism caused by a pituitary tumor, surgery may be required. However, surgery may not cure the hypothyroidism, and thyroid replacement will still be needed.

Myxedema coma is treated by intravenous (IV) thyroid replacement and steroid therapy. Supportive therapy of oxygen, assisted ventilation, fluid replacement, and intensive care nursing may be indicated.

• Unresponsiveness
• Decreased breathing
• Low blood pressure
• Low blood sugar
• Below-normal temperature

• Heart disease
• Infertility
• Miscarriage in pregnant women
• Adrenal crisis, if thyroid replacement is begun prior to steroids in hypoadrenal patients

Call your health care provider if signs of hypothyroidism are present, or if chest pain or rapid heartbeat occur.

Call your health care provider if restlessness, rapid weight loss, sweating, or other symptoms occur after beginning treatment for this disorder.

Call your health care provider if headache, visual loss, or breast discharge occur.