Levoxyl

Generic Name: levothyroxine (LEE voe thy ROX een)
Brand Names: Levothroid, Levoxyl, Synthroid, Unithroid

What is Levoxyl?

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Levoxyl is a replacement for a hormone that is normally produced by your thyroid gland to regulate the body's energy and metabolism. Levoxyl is given when the thyroid does not produce enough of this hormone on its own.

Levoxyl treats hypothyroidism (low thyroid hormone). It is also used to treat or prevent goiter (enlarged thyroid gland), which can be caused by hormone imbalances, radiation treatment, surgery, or cancer.

Levoxyl should not be used to treat obesity or weight problems.

Levoxyl may also be used for other purposes not listed in this medication guide.

Important information about Levoxyl

Since thyroid hormone occurs naturally in the body, almost anyone can take Levoxyl. You should not use this medication if you have had a heart attack, a thyroid disorder called thyrotoxicosis, or an adrenal gland problem that is not controlled by treatment.

Before taking this medication, tell your doctor if you have heart disease, coronary artery disease, anemia (lack of red blood cells), diabetes, problems with your pituitary or adrenal glands, or a history of blood clots.

If you use insulin or take diabetes medicine by mouth, ask your doctor if your dose needs to be changed when you start using Levoxyl.

Different brands of levothyroxine may not work the same. If you get a prescription refill and your new pills look different, talk with your pharmacist or doctor.

It may take several weeks before your body starts to respond to this medication. Do not stop taking this medication suddenly. Even if you feel well, you may still need to take this medicine every day for the rest of your life to replace the thyroid hormone your body cannot produce.

There are many other medicines that can affect Levoxyl. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor.

Before taking Levoxyl

If you use insulin or take diabetes medicine by mouth, ask your doctor if your dose needs to be changed when you start using Levoxyl.

Levoxyl is in the FDA pregnancy category A. This means that it is safe to use while you are pregnant. It is also safe to use while you are breast-feeding a baby. This drug does pass into breast milk, but it is not expected to be harmful to a nursing infant.

Tell your doctor if you become pregnant during treatment. You may need to increase your dose during pregnancy or if you plan to breast-feed.

In most cases, you will need to take Levoxyl for the rest of your life. Taking Levoxyl over long periods of time may cause bone loss, which can lead to osteoporosis. Talk with your doctor about how this could affect you.

How should I take Levoxyl?

Take Levoxyl exactly as your doctor has prescribed it for you. Do not use more of the medication than recommended. Do not take Levoxyl for longer than your doctor has prescribed.

Your doctor may occasionally change your dose to make sure you get the best results from this medication.

It is very important to take Levoxyl with a full glass (8 ounces) of water. The Levoxyl tablet can dissolve very quickly and swell in the throat, possibly causing choking or gagging. Take this medicine on an empty stomach, 30 minutes before eating. Levoxyl is usually taken in the morning. Follow your doctor's dosing instructions and try to take this medication at the same time each day.

To be sure this medication is helping your condition, your blood will need to be tested on a regular basis. Your kidney or liver function may also need to be tested. It is important that you not miss any scheduled visits to your doctor.

Tell any doctor or dentist who treats you that you are using Levoxyl.

Store Levoxyl at room temperature away from moisture and heat.

What happens if I miss a dose?

Take the missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and take the medicine at the next regularly scheduled time. Do not take extra medicine to make up the missed dose.

What happens if I overdose?

Seek emergency medical attention if you think you have used too much of this medicine.

Overdose symptoms may include chest pain, pounding heartbeat, shortness of breath, tremor, leg cramps, confusion, vomiting, diarrhea, or seizures.

What should I avoid while taking Levoxyl?

Do not change brands or change to a generic levothyroxine drug product without first asking your doctor. Different brands of levothyroxine may not work the same. If you get a prescription refill and your new pills look different, talk with your pharmacist or doctor.

Avoid the following food products, which can make your body absorb less Levoxyl: infant soy formula, cotton seed meal, walnuts, and high-fiber foods.

Levoxyl side effects

Stop using Levoxyl and get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Call your doctor at once if you have any of these serious side effects:

headache;
sleep problems (insomnia);
nervous or irritable feeling;
fever, hot flashes, sweating;
changes in your menstrual periods;
appetite changes, weight changes;

Less serious side effects may include mild hair loss.

This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect.

What other drugs will affect Levoxyl?

The following drugs may cause medical problems if you use them with Levoxyl: lithium, amiodarone, or antidepressants. Tell your doctor if you have recently received radiation therapy with iodine (such as I-131).

This list is not complete and there are many other drugs that can interact with Levoxyl. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor.

Certain medicines can be continued, but they may make Levoxyl less effective if taken at the same time. If you use any of the following drugs, use them at least 4 hours before or 4 hours after you take Levoxyl:

calcium carbonate (Caltrate, Citracal, Oystercal, and others);
ferrous sulfate iron supplement;
sucralfate (Carafate);
sodium polystyrene sulfonate (Kayexalate, Kionex, and others);
antacids that contain aluminum (Amphojel, Gaviscon, Maalox, Mylanta, Riopan, Rulox, Tums, and others); and
cholesterol-lowering drugs cholestyramine (Questran) and colestipol (Colestid).

Where can I get more information?

Your pharmacist can provide more information about Levoxyl.

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. ('Multum') is accurate, up-to-date, and complete, but no guarantee is made to that effect. 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. Multum's drug information is an informational resource designed to assist licensed healthcare practitioners in caring for their patients and/or to serve consumers viewing this service as a supplement to, and not a substitute for, the expertise, skill, knowledge and judgment of healthcare practitioners. 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.