DRUG INTERACTIONS: Before using this medication, tell your doctor or pharmacist of all prescription and nonprescription drugs you may use, especially of: warfarin, digoxin, estrogen products (including estrogen-containing birth control pills), diabetes medicines (e.g., insulin, glipizide, rosiglitazone), amiodarone, iodide (including radiographic contrast agents containing iodine), lithium, anti-thyroid agents (e.g., methimazole, propylthiouracil), androgens/anabolic steroids, glucocorticoids (e.g., dexamethasone, prednisone), high dose salicylates (e.g., aspirin), phenobarbital, rifamycins (e.g., rifampin), beta blockers (e.g., propranolol), antidepressants (e.g., amitriptyline, maprotiline, sertraline), cytokines (e.g., interferon-alpha, interleukin-2), growth hormones, ketamine, theophylline. Check the labels on all your medicines (e.g., cough-and-cold products, diet aids) because they may contain ingredients such as decongestants or caffeine that could increase your heart rate or blood pressure. Ask your pharmacist about the safe use of these products. Certain medicines may decrease absorption of this drug into your bloodstream. Therefore, take levothyroxine 4 hours apart from: calcium supplements, iron supplements, aluminum, calcium or magnesium antacids, simethicone, cholestyramine, colestipol, sucralfate, sodium polystyrene sulfonate. Certain foods may decrease absorption of this medication when taken at the same time. Take levothyroxine separately from: soybean flour (soybean infant formula), walnuts, dietary fiber. Do not start or stop any medicine without doctor or pharmacist approval.

OVERDOSE: If overdose is suspected, contact your local poison control center or emergency room immediately. US residents can call the US national poison hotline at 1-800-222-1222. Canadian residents should call their local poison control center directly. Symptoms of overdose may include: excessive sweating, extreme nervousness, irregular heartbeat, chest pain, seizures.

NOTES: Laboratory and/or medical tests (e.g., thyroid function tests) should be done periodically to monitor the effectiveness of this medication. Inform your doctor if you change to a different brand of thyroid hormone.

MISSED DOSE: If you miss a dose, take it as soon as you remember. If it is near the time of the next dose, skip the missed dose and resume your usual dosing schedule. Do not double the dose to catch up. Call your doctor if you miss 2 or more doses in a row.

STORAGE: Store at room temperature (77 degrees F or 25 degrees C) away from light and moisture. Brief storage between 59 and 86 degrees F (15 and 30 degrees C) is permitted. Do not store in the bathroom. Keep all medicines away from children and pets.

From the Doctors at MedicineNet.com

Hypothyroidism - Learn about Hypothyroidism (underactive thyroid) including causes, symptoms (such as weight gain, fatigue, and depression), diagnosis, and treatment. Source:MedicineNet Thyroid Blood Tests - Read about thyroid blood tests, which are used to diagnose disease of the thyroid such as hyperthyroidism and hyperthyroidism, as well as point to other diseases of the thyroid gland. Source:MedicineNet Thyroid Nodules - Thyroid nodules can be either benign or malignant (cancerous). The majority of thyroid nodules are benign. Source:MedicineNet Read 39 more levothyroxine sodium related articles ... So Much to Do, So Little Sleep Head Injuries All Too Common in Summer Play Health Tip: The Word on Wisdom Teeth Health Tip: Make Exercise a Daily Habit New Source of Heart Stem Cells Found Health Highlights: June 23, 2008 Poorer Patients Have Poorer Survival After Cancer Diagnosis One Gene May Be Key to Myeloma Crocodile Babies Cry Out for Hatching Immune Molecule Key to Preventing Organ Rejection