IMPORTANT SAFETY INFORMATION
WARNING: NOT FOR THE TREATMENT OF OBESITY OR FOR WEIGHT LOSS.
• Thyroid hormones, including TIROSINT, 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.
CONTRAINDICATIONS
• Uncorrected adrenal insufficiency
WARNINGS AND PRECAUTIONS
• Cardiac adverse reactions in the elderly and in patients with underlying cardiovascular disease. Initiate TIROSINT at less than the full replacement dose because of the increased risk of cardiac adverse reactions, including atrial fibrillation
• Myxedema coma: Do not use oral thyroid hormone drug products to treat myxedema coma
• Acute adrenal crisis in patients with concomitant adrenal insufficiency: Treat with replacement glucocorticoids prior to initiation of TIROSINT treatment
• 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
• 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
• Decreased bone mineral density associated with thyroid hormone over-replacement. Over-replacement can increase bone reabsorption and decrease bone mineral density. Give the lowest effective dose
• Use for the suppression of nontoxic diffuse goiter or nodular thyroid disease: Use is not recommended in iodine-insufficient patients
Limitations of Use
• Not indicated for suppression of benign thyroid nodules and nontoxic diffuse goiter in iodine-sufficient patients
• Not indicated for treatment of transient hypothyroidism during the recovery phase of subacute thyroiditis
Adverse Reactions
Common adverse reactions with levothyroxine therapy are primarily those of hypothyroidism due to therapeutic overdosage. They include the following:
• General: fatigue, increased appetite, weight loss, heat intolerance, fever, excessive sweating
• Central Nervous System: headache, hyperactivity, nervousness, anxiety, irritability, emotional lability, insomnia
• Musculoskeletal: tremors, muscle weakness
• Cardiovascular: palpitations, tachycardia, arrythmias, increased pulse and blood pressure, heart failure, angina, myocardial infarction, cardiac arrest
• Respiratory: dyspnea
• Gastrointestinal (GI): diarrhea, vomiting, abdominal cramps, elevations in liver function tests
• Dermatologic: hair loss, flushing
• Endocrine: decreased bone mineral density
• Reproductive: menstrual irregularities, impaired fertility
Adverse reactions in Children
Pseudotumor cerebri and slipped capital femoral epiphysis have been reported in children receiving levothyroxine therapy. Overtreatment may result in craniosynostosis in infants and premature closure of the epiphyses in children with resultant compromised adult height. Seizures have been reported rarely with the institution of levothyroxine therapy.
Hypersensitivity Reactions
Hypersensitivity reactions to inactive ingredients (in this product or other levothyroxine products) have occurred in patients treated with thyroid ho0rmone products. These include urticaria, pruritis, skin rash, flushing, angioedema, various GI symptoms (abdominal pain, nausea, vomiting and diarrhea), fever, arthralgia, serum sickness and wheezing. Hypersensitivity to levothyroxine itself is not known to occur.
For Full Prescribing Information, including Boxed Warning, go to Tirosint-PI.pdf