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Levothyroxine

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Notes
Related terms
Uses
Dosing
Safety
Author information

Notes

    Related terms
    • Brand Names: U.S.: Levothroid®;Levoxyl®;Synthroid®;Tirosint®;Unithroid®
    • Brand Names: Canada: Eltroxin®;Euthyrox;Levothyroxine Sodium;Synthroid®

    Uses
    • It is used to add thyroid hormone to the body.
    • Levothyroxine works to fuel growth and the making of glucose, protein, and fat in the body.

    Dosing

    How to take

    • All products:
    • Take on an empty stomach 30 minutes before breakfast.
    • Take with a full glass of water.
    • Take as you have been told, even if you are feeling better.
    • Capsule:
    • Swallow capsule whole. Do not chew, break, or crush.
    • Tablet:
    • You may crush tablet and mix with 1 or 2 teaspoons (5 or 10 mL) of water.
    • Shot:
    • It is given as a shot into a vein.

    Missed Dose

    • Take a missed dose as soon as you think about it.
    • If it is close to the time for your next dose, skip the missed dose and go back to your normal time.
    • Do not take 2 doses at the same time or extra doses.
    • Do not change the dose, brand, or stop this drug. Talk with the doctor.

    Storage

    • Oral:
    • Store at room temperature.
    • Protect from light.
    • Protect from water. Do not store in a bathroom or kitchen.
    • Shot:
    • This drug will be given to you in a hospital or doctor's office. You will not store it at home.

    Safety



    Warnings

    • Do not use this drug to treat obesity or for weight loss.

    Avoid

    • If you have an allergy to levothyroxine or any other part of this drug.
    • Tell your doctor if you are allergic to any drugs. Make sure to tell about the allergy and what signs you had. This includes telling about rash; hives; itching; shortness of breath; wheezing; cough; swelling of face, lips, tongue, or throat; or any other signs.
    • If you have any of these health problems: Overactive thyroid gland, recent heart attack, or weak adrenal gland.

    Precautions

    • Keep a list of all your drugs (prescription, natural products, vitamins, OTC) with you. Give this list to your doctor.
    • There is more than one brand of this drug. One brand cannot safely be used for the other. Your doctor will tell you about any needed change.
    • Do not run out of this drug.
    • If you have heart disease, talk with your doctor.
    • If you have high blood sugar (diabetes), you will need to watch your blood sugar closely.
    • If you have soft, brittle bones (osteoporosis), talk with your doctor.
    • If you are allergic to tartrazine, talk with your doctor. Some products have tartrazine.
    • Have your blood work checked. Talk with your doctor.
    • Check all drugs you are taking with your doctor. This drug may not mix well with some other drugs.
    • Do not take iron products, antacids that have aluminum and magnesium, calcium carbonate, simethicone, sucralfate, Kayexalate®, colestipol, or cholestyramine within 4 hours of this drug.
    • Tell your doctor if you are pregnant or plan on getting pregnant.

    Side Effects

    • Feeling more or less hungry.
    • A change in weight without trying.
    • Nervous and excitable.
    • Not able to sleep.
    • Shakiness.
    • Bothered by heat.
    • Sweating a lot.
    • Headache.
    • Upset stomach or throwing up. Many small meals, good mouth care, sucking hard, sugar-free candy, or chewing sugar-free gum may help.
    • Loose stools (diarrhea).
    • Grouchy or touchy.
    • Leg cramps.
    • Weak bones with long-term use.

    Contact a healthcare provider

    • If you think there was an overdose, call your local poison control center or ER right away.
    • Signs of a very bad reaction to the drug. These include wheezing; chest tightness; fever; itching; bad cough; blue or gray skin color; seizures; or swelling of face, lips, tongue, or throat.
    • Chest pain or pressure or a fast heartbeat.
    • Trouble breathing.
    • A big weight gain or loss.
    • Very nervous and excitable.
    • Any rash.
    • Side effect or health problem is not better or you are feeling worse.

    General Statements

    • If you have a very bad allergy, wear an allergy ID at all times.
    • Do not share your drugs with others and do not take anyone else's drugs.
    • Keep all drugs out of the reach of children and pets.
    • Most drugs may be thrown away in household trash after mixing with coffee grounds or kitty litter and sealing in a plastic bag.
    • In Canada, take any unused drugs to the pharmacy. Also, visit http://www.hc-sc.gc.ca/hl-vs/iyh-vsv/med/disposal-defaire-eng.php#th to learn about the right way to get rid of unused drugs.
    • Keep a list of all your drugs (prescription, natural products, vitamins, OTC) with you. Give this list to your doctor.
    • Call your doctor for help with any side effects. If in the U.S., you may also call the FDA at 1-800-FDA-1088 or if in Canada, you may also call Health Canada's Vigilance Program at 1-866-234-2345.
    • Talk with the doctor before starting any new drug, including OTC, natural products, or vitamins.

    Author information
    • Copyright © 1978-2013 Lexi-Comp Inc. All rights reserved.

    Copyright © 2011 Natural Standard (www.naturalstandard.com)


    The information in this monograph is intended for informational purposes only, and is meant to help users better understand health concerns. Information is based on review of scientific research data, historical practice patterns, and clinical experience. This information should not be interpreted as specific medical advice. Users should consult with a qualified healthcare provider for specific questions regarding therapies, diagnosis and/or health conditions, prior to making therapeutic decisions.

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