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LEVOXYL® (levothyroxine sodium) Highlights


These highlights do not include all the information needed to use LEVOXYL safely and effectively. See full prescribing information for LEVOXYL.

LEVOXYL® (levothyroxine sodium) tablets, for oral use
Initial U.S. Approval: 2001


See full prescribing information for complete boxed warning.

  • Thyroid hormones, including LEVOXYL, should not be used for the treatment of obesity or for weight loss.
  • Doses beyond the range of daily hormonal requirements may produce serious or even life-threatening manifestations of toxicity (6, 7.7, 10).


LEVOXYL is L-thyroxine (T4) indicated in pediatric and adult patients for:

  • Hypothyroidism: As replacement in primary (thyroidal), secondary (pituitary), and tertiary (hypothalamic) congenital or acquired hypothyroidism. (1)
  • Pituitary Thyrotropin (Thyroid-Stimulating Hormone, TSH) suppression: As an adjunct to surgery and radioiodine therapy in the management of well-differentiated thyroid cancer. (1)

Limitations of Use:

Not indicated for suppression of benign thyroid nodules and nontoxic diffuse goiter in iodine-sufficient patients. (1)
Not indicated for treatment of hypothyroidism during the recovery phase of subacute thyroiditis. (1)


  • Administer once daily, on an empty stomach, one-half to one hour before breakfast with a full glass of water. (2.1)
  • Administer at least 4 hours before or after drugs that are known to interfere with absorption. (2.1)
  • Evaluate the need for dose adjustments when regularly administering within one hour of certain foods that may affect absorption. (2.1)
  • Starting dose depends on a variety of factors, including age, body weight, cardiovascular status, concomitant medical conditions (including pregnancy), concomitant medications, co-administered food, and the specific nature of the condition being treated. Peak therapeutic effect may not be attained for 4 to 6 weeks. (2.2)
  • See full prescribing information for dosing in specific patient populations. (2.3)
  • Adequacy of therapy determined with periodic monitoring of TSH and/or T4 as well as clinical status. (2.4)


Tablets: 25 mcg, 50 mcg, 75 mcg, 88 mcg, 100 mcg, 112 mcg, 125 mcg, 137 mcg, 150 mcg, 175 mcg, 200 mcg (3)


Uncorrected adrenal insufficiency. (4)


  • Cardiac adverse reactions in the elderly and in patients with underlying cardiovascular disease: Initiate LEVOXYL at less than the full replacement dose because of the increased risk of cardiac adverse reactions, including atrial fibrillation. (2.3, 5.1, 8.5)
  • Myxedema coma: Do not use oral thyroid hormone drug products to treat myxedema coma. (5.2)
  • Acute adrenal crisis in patients with concomitant adrenal insufficiency: Treat with replacement glucocorticoids prior to initiation of LEVOXYL treatment. (5.3)
  • Prevention of hyperthyroidism or incomplete treatment of hypothyroidism: Proper dose titration and careful monitoring is critical to prevent the persistence of hypothyroidism or the development of hyperthyroidism. (5.4)
  • Worsening of diabetic control: Therapy in patients with diabetes mellitus may worsen glycemic control and result in increased antidiabetic agent or insulin requirements. Carefully monitor glycemic control after starting, changing, or discontinuing thyroid hormone therapy. (5.5)
  • Decreased bone mineral density associated with thyroid hormone over-replacement: Over-replacement can increase bone resorption and decrease bone mineral density. Give the lowest effective dose. (5.6)


Common adverse reactions for LEVOXYL are primarily those of hyperthyroidism due to therapeutic overdosage: arrhythmias, myocardial infarction, dyspnea, muscle spasm, headache, nervousness, irritability, insomnia, tremors, muscle weakness, increased appetite, weight loss, diarrhea, heat intolerance, menstrual irregularities, and skin rash. (6)

To report SUSPECTED ADVERSE REACTIONS, contact Pfizer, Inc. at 1-800-438-1985 or FDA at 1-800-FDA-1088 or


See full prescribing information for drugs that affect thyroid hormone pharmacokinetics and metabolism (e.g., absorption, synthesis, secretion, catabolism, protein binding, and target tissue response) and may alter the therapeutic response to LEVOXYL. (7)


Pregnancy may require the use of higher doses of levothyroxine. (2.3, 8.1)

See 17 for PATIENT COUNSELING INFORMATION and FDA-approved patient labeling.

Revised: 12/2018

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