Liomny
LIOTHYRONINE SODIUM
Indications and usage 1 INDICATIONS AND USAGE LIOMNY is an L-triiodothyronine (T3) indicated for: Hypothyroidism: As replacement in primary (thyroidal), secondary (pituitary), and tertiary (hypothalamic) congenital or acquired hypothyroidism ( 1.1 ) Pituitary Thyrotropin (Thyroid-Stimulating Hormone, TSH) Suppression: As an adjunct to surgery and radioiodine therapy in the management of well-differentiated thyroid cancer ( 1.2 ) Thyroid Suppression Test: As a diagnostic agent in suppression tests to differentiate suspected mild hyperthyroidism or thyroid gland autonomy ( 1.3 ) 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 ) 1.1 Hypothyroidism LIOMNY is indicated as a replacement therapy in primary (thyroidal), secondary (pituitary), and tertiary (hypothalamic) congenital or acquired hypothyroidism. 1.2 Pituitary Thyrotropin (Thyroid-Stimulating Hormone, TSH) Suppression LIOMNY is indicated as an adjunct to surgery and radioiodine therapy in the management of well-differentiated thyroid cancer. 1.3 Thyroid Suppression Test LIOMNY is indicated as a diagnostic agent in suppression tests to differentiate suspected mild hyperthyroidism or thyroid gland autonomy.
Limitations of Use LIOMNY is not indicated for suppression of benign thyroid nodules and nontoxic diffuse goiter in iodine-sufficient patients as there are no clinical benefits and overtreatment with LIOMNY may induce hyperthyroidism [see Warnings and Precautions (5.4) ].
Structured Monograph
Clinical summary
Indications and usage 1 INDICATIONS AND USAGE LIOMNY is an L-triiodothyronine (T3) indicated for: Hypothyroidism: As replacement in primary (thyroidal), secondary (pituitary), and tertiary (hypothalamic) congenital or acquired hypothyroidism ( 1.1 ) Pituitary Thyrotropin (Thyroid-Stimulating Hormone, TSH) Suppression: As an adjunct to surgery and radioiodine therapy in the management of well-differentiated thyroid cancer ( 1.2 ) Thyroid Suppression Test: As a diagnostic agent in suppression tests to differentiate suspected mild hyperthyroidism or thyroid gland autonomy ( 1.3 ) 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 ) 1.1 Hypothyroidism LIOMNY is indicated as a replacement therapy in primary (thyroidal), secondary (pituitary), and tertiary (hypothalamic) congenital or acquired hypothyroidism. 1.2 Pituitary Thyrotropin (Thyroid-Stimulating Hormone, TSH) Suppression LIOMNY is indicated as an adjunct to surgery and radioiodine therapy in the management of well-differentiated thyroid cancer. 1.3 Thyroid Suppression Test LIOMNY is indicated as a diagnostic agent in suppression tests to differentiate suspected mild hyperthyroidism or thyroid gland autonomy. Limitations of Use LIOMNY is not indicated for suppression of benign thyroid nodules and nontoxic diffuse goiter in iodine-sufficient patients as there are no clinical benefits and overtreatment with LIOMNY may induce hyperthyroidism [see Warnings and Precautions (5.4) ]. LIOMNY is not indicated for treatment of hypothyroidism during the recovery phase of subacute thyroiditis. Dosage and administration 2 DOSAGE AND ADMINISTRATION Administer LIOMNY orally once daily and individual dosage according to patient response and laboratory findings ( 2.1 ) See full prescribing information for recommended dosage for hypothyroidism ( 2.2 ) TSH suppression in well-differentiated thyroid cancer ( 2.3 ) and for thyroid suppression test ( 2.4 ) When switching a patient to LIOMNY discontinue levothyroxine therapy and initiate LIOMNY at a low dosage. Gradually increase the dose according to the patient's response ( 2.5 ) Adequacy of therapy determined with periodic monitoring of TSH and T3 levels as well as clinical status ( 2.6 ) 2.1 General Principles of Dosing The dose of LIOMNY for hypothyroidism or pituitary Thyroid-Stimulating Hormone (TSH) suppression depends on a variety of factors including: the patient's age, body weight, cardiovascular status, concomitant medical conditions (including pregnancy), concomitant medications, co-administered food and the specific nature of the condition being treated [see Dosage and Administration (2.2 , 2.3 , 2.4 ), Warnings and Precautions (5) , and Drug Interactions (7) ] . Dosing must be individualized to account for these factors and dose adjustments made based on periodic assessment of the patient's clinical response and laboratory parameters [see Dosage and Administration (2.4) ]. Administer LIOMNY orally once daily. 2.2 Recommended Dosage for Hypothyroidism Adults The recommended starting dosage is 25 mcg orally once daily. Increase the dose by 25 mcg daily every 1 or 2 weeks, if needed. The usual maintenance dose is 25 mcg to 75 mcg once daily. For elderly patients or patients with underlying cardiac disease, start with LIOMNY 5 mcg once daily and increase by 5 mcg increments at the recommended intervals. Serum TSH is not a reliable measure of LIOMNY dose adequacy in patients with secondary or tertiary hypothyroidism and should not be used to monitor therapy. Use the serum T3 level to monitor adequacy of therapy in this patient population. Pediatric Patients The recommended starting dosage is 5 mcg once daily, with a 5 mcg increase every 3 to 4 days until the desired response is achieved. Infants a few months old may require 20 mcg once daily for maintenance. At 1 year of age, 50 mcg once daily may be required. Above 3 years of age, the full adult dosage may be necessary [see Use in Specific Populations (8.4) ]. Newborns (0 to 3 months) at Risk for Cardiac Failure: Consider a lower starting dose in infants at risk for cardiac failure. Increase the dose as needed based on clinical and laboratory response. Pediatric Patients at Risk for Hyperactivity: To minimize the risk of hyperactivity in pediatric patients, start at one-fourth the recommended full replacement dose, and increase on a weekly basis by one-fourth the full recommended replacement dose until the full recommended replacement dose is reached. Pregnancy Pre-existing Hypothyroidism: Thyroid hormone dose requirements may increase during pregnancy. Measure serum TSH and free-T4 as soon as pregnancy is confirmed and, at minimum, during each trimester of pregnancy. In patients with primary hypothyroidism, maintain serum TSH in the trimester-specific reference range. For
Boxed Warning
WARNING: NOT FOR TREATMENT OF OBESITY OR FOR WEIGHT LOSS Thyroid hormones, including LIOMNY, either alone or with other therapeutic agents, should not be used for the treatment of obesity or for weight loss. In euthyroid patients, doses within the range of daily hormonal requirements are ineffective for weight reduction. Larger doses may produce serious or even life-threatening manifestations of toxicity, particularly when given in association with sympathomimetic amines such as those used for their anorectic effects [see Adverse Reactions (6) , Drug Interactions (7.7) , and Overdosage (10) ]. WARNING: NOT FOR TREATMENT OF OBESITY OR FOR WEIGHT LOSS See full prescribing information for complete boxed warning. Thyroid hormones, including LIOMNY 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 )
Monitoring
- • 5 WARNINGS AND PRECAUTIONS Cardiac adverse reactions in the elderly and in patients with underlying cardiovascular disease: Initiate LIOMNY 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 LIOMNY 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.
Interaction Notes
- • 7 DRUG INTERACTIONS 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 LIOMNY 7.1 Drugs Known to Affect Thyroid Hormone Pharmacokinetics Many drugs can exert effects on thyroid hormone pharmacokinetics (e.g.
- • absorption, synthesis, secretion, catabolism, protein binding, and target tissue response) and may alter the therapeutic response to LIOMNY (see Tables 1 - 4).
- • Table 1: Drugs That May Decrease T3 Absorption (Hypothyroidism) Potential impact: Concurrent use may reduce the efficacy of LIOMNY by binding and delaying or preventing absorption, potentially resulting in hypothyroidism.
- • Drug or Drug Class Effect Bile Acid Sequestrants -Colesevelam -Cholestyramine -Colestipol Ion Exchange Resins -Kayexalate -Sevelamer Bile acid sequestrants and ion exchange resins are known to decrease thyroid hormones absorption.