The physiological actions of thyroid hormones are produced predominantly by T3, the majority of which (approximately 80%) is derived from T4 by deiodination in peripheral tissues. Chloral Hydrate Diazepam Ethionamide Lovastatin Metoclopramide 6-Mercaptopurine Nitroprusside Para-aminosalicylate sodium Perphenazine Resorcinol (excessive topical use) Thiazide Diuretics These agents have been associated with thyroid hormone and/or TSH level alterations by various mechanisms. Contraindications Levothyroxine is contraindicated in patients with untreated subclinical (suppressed serum TSH level with normal T3 and T4 levels) or overt thyrotoxicosis of any etiology and in patients with levothroid synthroid myocardial infarction.
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When the optimum replacement dose has been attained, clinical (physical examination) and biochemical monitoring may be performed every 6-12 months, depending on the clinical situation, and whenever there is a change in the patient's status. Tell your doctor if your levothroid synthroid includes any of these foods. Familial hyper- or hypo-thyroxine binding globulinemias have been described, with the incidence of TBG deficiency approximating 1 in 9000. These include urticaria, pruritus, skin rash, flushing, angioedema, various GI symptoms (abdominal pain, nausea, vomiting and diarrhea), fever, arthralgia, serum sickness and wheezing. It should not be used to treat obesity or weight problems. How should I take Synthroid? Take Synthroid exactly as prescribed by your doctor. Undertreatment and overtreatment should be avoided (see PRECAUTIONS - Pediatric Use). Even if you feel well, you may still need to take this levothroid synthroid every day for the rest of your life to replace the thyroid hormone your body cannot produce. Elimination Thyroid hormones are primarily eliminated by the kidneys. How should I take levothyroxine? Take exactly as prescribed by your doctor. If you get a prescription refill and your new pills look different, talk with your pharmacist or doctor. The drug is absorbed better on an empty stomach. A lower starting dose (e.g., 25 mcg/day) should be considered in infants at risk for cardiac failure, and the dose should be increased in 4-6 weeks as needed based on clinical and laboratory response to treatment. Levothyroxine, at doses individualized according to levothroid synthroid response, is effective as replacement or supplemental therapy in hypothyroidism of any etiology, except transient hypothyroidism during the recovery phase of subacute thyroiditis. It may take several weeks before you notice an improvement in your symptoms.
You may report side effects to FDA at 1-800-FDA-1088. Synthroid is also used to treat or prevent goiter (enlarged thyroid gland), which can be caused by hormone imbalances, radiation treatment, surgery, or cancer. A serum TSH level should be obtained 6-8 weeks postpartum. Mix well. No COMMON side effects have been reported with the use of Synthroid. Using alcohol or tobacco with certain medicines may also cause interactions to occur. levothroid synthroid liver or kidney levothroid synthroid may also need to be tested. Discuss with your healthcare professional the use of your medicine with food, alcohol, or tobacco. Other Medical Problems The presence of other medical problems may affect the use of this medicine. Protein-bound thyroid hormones exist in reverse equilibrium with small amounts of free hormone. The following information includes only the average doses of this medicine. It is recommended that a physical examination and a serum TSH measurement be performed at least annually in patients receiving Synthroid (see WARNINGS, PRECAUTIONS, and DOSAGE AND ADMINISTRATION).