Eltroxin Medication Information:

Eltroxin medication comes in several different strengths; click on the strength you need to view prices from pharmacies competing to earn your business.

Eltroxin 0.050 mg
Eltroxin 0.100 mg
Eltroxin 25 25 mcg
Eltroxin 125 125 mcg

About Eltroxin

What Eltroxin is used for

ELTROXIN contains the active ingredient levothyroxine sodium which is the same as the hormone, thyroxine. Thyroxine and another hormone, liothyronine, are two hormones produced and released by the thyroid gland. These hormones are responsible for maintaining a normal rate of metabolism in the body.

In other areas of the body, thyroxine is converted into liothyronine, which is a more active form of thyroxine.

Hypothyroidism occurs when the thyroid gland is unable to produce normal amounts of thyroxine resulting in the level of thyroid hormones in the blood to decrease. The body cannot function properly without this hormone, resulting in poor growth, slow speech, lack of energy, weight gain, hair loss, dry thick skin, and increased sensitivity to cold.

What Eltroxin does

ELTROXIN is given to replace the thyroxine that would normally be produced naturally by the thyroid gland. ELTROXIN, when taken correctly, reverses the symptoms of hypothyroidism.

Once the thyroid gland becomes unable to produce thyroxine, it will not generally return to normal function. Therefore, once ELTROXIN is started, it usually needs to be taken for the rest of a person's life.

ELTROXIN is also used to treat goiter (enlarged thyroid gland) and congenital hypothyroidism (cretinism).

When Eltroxin should not be used

Do not use this medication if:

  • If you have had an allergic reaction before to any of the ingredients in ELTROXIN.

  • If you have thyrotoxicosis, a disease in which the thyroid gland is overactive and produces too much thyroxine.

  • If you have had an acute myocardial infarction (heart attack).

  • If you have had uncorrected adrenal insufficiency (kidney problems).

What the medicinal ingredient is

Levothyroxine sodium.

What the important nonmedicinal ingredients for Eltroxin are

Acacia powder, corn starch, lactose, magnesium stearate and coloring agents.

What dosage forms Eltroxin comes in

Tablets: 50, 100, 150, 200 and 300 µg.

Warnings and Precautions

Serious Warnings and Precautions

Thyroid hormones, including ELTROXIN, either by itself or with other medications should not be used for weight loss. Larger doses may cause serious side effects especially when taken together with medications used for weight loss.

BEFORE you use ELTROXIN talk to your doctor or pharmacist if:

  • you have any other medical problems, especially:

    • Clotting disorders

    • Heart disease

    • A history of problems with your thyroid, adrenal or pituitary gland

    • Diabetes

    • Allergic to any foods or medicines

    • Are pregnant or intend to become pregnant

    • Are breast-feeding, or planning to breast-feed

    • Are taking any other medications, including prescription and over-the-counter medications as well as vitamins and other supplements

    • Are taking medication to thin your blood such as warfarin

  • Tell your doctor about any surgery you are planning. Before the surgery tell your dentist or surgeon that you are taking ELTROXIN.

Interactions with Eltroxin

Some medications and foods can interfere with the effectiveness of your thyroid medication or your overall treatment—these are called “drug and food interactions”.

Make sure your doctor or healthcare provider has a complete list of all prescription medications, vitamins, or over-the-counter medications you are currently taking. In some cases, your condition or therapy may need additional monitoring. Your doctor may ask you to take your thyroid medication at a different time of the day, separately from some medications, to avoid potential interactions.

This is not a complete list of drug interactions. For more information, contact your doctor or pharmacist.

Drugs that may interact with ELTROXIN include:

Nutritional Supplements:

  • Calcium Carbonate

  • Ferrous Sulfate (Iron)

GI Therapies:

  • Antacids (aluminum and magnesium types)

Cardiovascular Therapies like:

  • Digoxin

  • Thiazide Diuretics (Hydrochlorothiazide)

  • Oral Anticoagulants (Coumadin-Warfarin Sodium)

  • Beta Blockers

Cholesterol Therapies.

  • Some statins


  • Tricyclics (Amitriptyline)

  • Tetracyclics (Maprotiline)

  • Reuptake Inhibitors (SSRIs like Prozac-Fluoxetine)

Other (CNS) Therapies Neurologic/Psychiatric:

  • Lithium

  • Carbamazepine

  • Phenobarbital

  • Diazepam

  • Phenytoin (Dilantin)

Some Cancer Therapies.

General or other Therapies:

  • Antidiabetic Agents (such as Insulin)

  • Oral contraceptive pill

  • Drugs used for weight reduction

Drug-Food Interactions: Eating certain foods like soybean flour (infant formula), cotton seed meal, walnuts, calcium and calcium-fortified orange juice, and dietary fibre may decrease absorption of your medicine (levothyroxine sodium).

Please discuss with your doctor whether a dose adjustment of your medicine is necessary.

Proper Use of Eltroxin

Usual dose

The usual dose of ELTROXIN is different for everyone.

Your doctor will take into account your age, weight, presence of any other illness and the severity and length of time you have been ill prior to beginning treatment with ELTROXIN.


Symptoms are not always evident or may not appear until several days after taking your ELTROXIN medication.

Signs and symptoms of overdose include, but are not limited to: weight loss, increased appetite, heart palpitations (fast or irregular beating of heart), nervousness, diarrhea, abdominal cramps, sweating, increased pulse and blood pressure, fever, and menstrual irregularities.

If you suspect that you or anyone else has taken too much ELTROXIN you may need to seek immediate medical attention.

For management of a suspected overdose, contact your regional Poison Control Centre.

Missed dose

Take the missed dose as soon as you remember it. However, if it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule. Do not take a double dose to make up for a missed one.

Side Effects for Eltroxin and What to Do About Them

Although side effects from levothyroxine are not common, they can occur. Tell your doctor if any of these symptoms are severe or do not go away:

  • weight loss, tremor, headache, upset stomach, diarhea, stomach cramps, nervousness, irritability, insomnia, excessive sweating, increased appetite, fever, changes in menstrual cycle, sensitivity to heat, temporary hair loss (particularly in children during the first month of therapy).

Seek emergency medical attention or contact your doctor immediately if you experience any of the following:

  • an allergic reaction (difficulty breathing; closing of the throat; swelling of the lips, tongue, or face; or hives);

  • vomiting; or

  • chest pain, irregular heartbeat, shortness of breath.

This is not a complete list of side effects. For any unexpected effects while taking ELTROXIN, contact your doctor or pharmacist.


Technical Information