Overdose symptoms may include headache, leg cramps, tremors, feeling nervous or irritable, chest pain, shortness of breath, and fast or pounding heartbeats. Avoid the following food products, which can make your body absorb less levothyroxine: grapefruit juice, infant soy formula, soybean flour, cotton seed meal, walnuts, and high-fiber foods.
Get emergency medical help if you have signs of an allergic reaction : hives; difficult breathing; swelling of your face, lips, tongue, or throat. This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects.
Many other medicines can be affected by your thyroid hormone levels. Certain other medicines may also increase or decrease the effects of levothyroxine. Certain medicines can make levothyroxine less effective if taken at the same time.
If you use any of the following drugs, avoid taking them within 4 hours before or 4 hours after you take levothyroxine:. Many drugs can affect levothyroxine.
This includes prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible interactions are listed here. Tell your doctor about all your current medicines and any medicine you start or stop using.
Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed. Every effort has been made to ensure that the information provided by Cerner Multum, Inc.
Drug information contained herein may be time sensitive. Multum information has been compiled for use by healthcare practitioners and consumers in the United States and therefore Multum does not warrant that uses outside of the United States are appropriate, unless specifically indicated otherwise.
Multum's drug information does not endorse drugs, diagnose patients or recommend therapy. The absence of a warning for a given drug or drug combination in no way should be construed to indicate that the drug or drug combination is safe, effective or appropriate for any given patient.
Multum does not assume any responsibility for any aspect of healthcare administered with the aid of information Multum provides. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse or pharmacist. This information does not replace the advice of a doctor.
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Your doctor may monitor your blood sugar level more closely while you take this drug and adjust your diabetes drugs if needed. For people with osteoporosis : Using levothyroxine for a long time can cause decreases in your bone mineral density and put you at higher risk of bone fractures.
For people with adrenal or pituitary gland problems: Let your doctor know if you have any adrenal or pituitary gland problems. Using levothyroxine can cause changes to your levels of thyroid hormone that could make these problems worse.
For people with blood clotting disorders: Let your doctor know if you have any blood clotting disorders. Taking levothyroxine may make it more difficult for your blood to clot and make bleeding more likely. It appears unlikely that this drug will harm a pregnancy. Not treating hypothyroidism could cause problems for both you and your pregnancy. You should not stop taking this drug during pregnancy.
For women who are breastfeeding: Small amounts of levothyroxine may pass into breast milk, but this drug is usually safe to take while breastfeeding. Talk to your doctor about the best way to feed your child while taking levothyroxine. Your doctor may choose to start you on a lower dosage. For children: Levothyroxine has only been approved for use in children for the treatment of hypothyroidism.
The tablet can be used safely in children of all ages. Levothyroxine oral tablet is used for long-term treatment. It may even lead to coma. For this drug to work well, a certain amount needs to be in your body at all times. If you take too much: You could have dangerous levels of the drug in your body. Symptoms of an overdose can include:. If your symptoms are severe, call or go to the nearest emergency room right away.
What to do if you miss a dose: Take your dose as soon as you remember. But if you remember just a few hours before your next scheduled dose, take only one dose. Never try to catch up by taking two doses at once. This could result in dangerous side effects. How to tell if the drug is working: You should feel your symptoms of low thyroid hormone decrease. For instance, you should have more energy, less tiredness, and less weakness. A prescription for this medication is refillable.
You should not need a new prescription for this medication to be refilled. If your dose is different, do not change it unless your doctor tells you to do so. The amount of medicine that you take depends on the strength of the medicine. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine.
If you miss a dose of this medicine, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule.
Do not double doses. Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Keep from freezing. Use the oral liquid within 15 days after opening the pouch. Keep the ampules in the pouch until you are ready to use them. If you will be taking this medicine for a long time, it is very important that your doctor check the progress of you or your child at regular visits. This will allow your doctor to see if the medicine is working properly and to decide if you should continue to take it.
Blood tests will be needed to check for unwanted effects. Levothyroxine should not be used for the treatment of obesity or for the purpose of losing weight. This medicine is not effective for weight reduction. If taken in large amounts, levothyroxine may cause serious unwanted effects. Hypothyroidism can sometimes cause infertility in men and women. Levothyroxine should not be used for the treatment of infertility unless it is caused by hypothyroidism.
For patients with diabetes: It is very important that you keep track of your blood or urine sugar levels as instructed by your doctor. Check with your doctor right away if you notice any changes in your sugar levels.
If you think you have become pregnant while using this medicine, tell your doctor right away. You may need a larger dose of levothyroxine while you are pregnant. Women who are post-menopausal or who use this medicine for a long time may have some bone loss, which could lead to osteoporosis. Talk with your doctor if you have questions or concerns about this. Do not switch brands without talking to your doctor or pharmacist, as each brand of levothyroxine contains a slightly different amount of medication.
Do not let anyone else take your medication. Ask your pharmacist any questions you have about refilling your prescription. It is important for you to keep a written list of all of the prescription and nonprescription over-the-counter medicines you are taking, as well as any products such as vitamins, minerals, or other dietary supplements. You should bring this list with you each time you visit a doctor or if you are admitted to a hospital.
It is also important information to carry with you in case of emergencies. Generic alternatives may be available. Levothyroxine pronounced as lee voe thye rox' een. Why is this medication prescribed? How should this medicine be used? Other uses for this medicine What special precautions should I follow? What special dietary instructions should I follow? What should I do if I forget a dose? What side effects can this medication cause? What should I know about storage and disposal of this medication?
Brand names. Talk to your doctor about the potential risks associated with this medication. Other uses for this medicine. What special precautions should I follow?
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