Euthyrox: Uses, Side Effects, Interactions & More


Euthyrox Uses: Levothyroxine (Euthyrox) is a medication employed to address hypothyroidism, a condition characterized by an underactive thyroid gland.

It functions by substituting or supplementing the thyroid hormone, which is typically produced by the thyroid gland.

Insufficient levels of thyroid hormone can arise naturally or result from thyroid gland injury due to radiation, medications, or surgical removal.

Maintaining adequate thyroid hormone levels is essential for supporting regular mental and physical functions. In children, it is also critical for typical mental and physical development.

Furthermore, levothyroxine can be utilized to manage various other thyroid-related disorders, including thyroid cancer.

It is worth noting that this medication should not be used for the treatment of infertility unless the infertility issue is specifically related to low thyroid hormone levels.


How to use Euthyrox

In order to use Euthyrox (levothyroxine) effectively, follow these guidelines:

  • Review Patient Information: If available, read the Patient Information Leaflet provided by your pharmacist before you start taking levothyroxine and whenever you refill your prescription. If you have any questions or concerns, consult your doctor or pharmacist for clarification
  • Oral Administration: Take this medication by mouth as directed by your doctor. Typically, it is taken once daily on an empty stomach, ideally 30 minutes to 1 hour before having breakfast
  • Full Glass of Water: Swallow the medication with a full glass of water unless your doctor instructs you differently
  • Capsule Form: If you are using the capsule form of this medication, swallow it whole. Do not break, crush, or chew the capsule. Those who cannot swallow the capsule whole (e.g., infants or small children) should use the tablet form of the medication
  • For Infants & Children: In the case of infants or children who cannot swallow whole tablets, you can crush the tablet and mix it with 1 to 2 teaspoons (5 to 10 milliliters) of water. Administer this mixture immediately using a spoon or dropper. Do not prepare this mixture in advance or combine the tablet with soy infant formula. It’s advisable to consult your pharmacist for additional information if needed.

Please be aware to always adhere to your doctor’s specific instructions regarding the administration of Euthyrox, and consult with healthcare professionals if you have any questions or concerns about the medication’s usage.



The Euthyrox dosage is based on your age, weight, medical condition, lab test results, response to treatment, and other medications you may be taking. Be sure to tell your doctor and pharmacist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).

Use this medication regularly in order to get the most benefit from it. To help you remember, take it at the same time each day.

Do not stop taking this medication without first consulting with your doctor. Thyroid replacement treatment is usually taken for life.

There are different brands of levothyroxine available. Do not change brands without first consulting your doctor or pharmacist.

At the same time, it’s crucial to be aware that specific medications, such as cholestyramine, colestipol, colesevelam, antacids, sucralfate, simethicone, iron supplements, sodium polystyrene sulfonate, and others, can reduce the absorption of thyroid hormone in your body.

To ensure proper absorption, it is advised to take these medications at least 4 hours apart from your levothyroxine (Euthyrox) dose.

If you begin to experience symptoms associated with low thyroid hormone levels, including tiredness, muscle aches, constipation, dry skin, weight gain, a slow heartbeat, or heightened sensitivity to cold, it is important to promptly inform your doctor.

Adjustments to your treatment may be necessary to ensure your thyroid function remains adequately regulated.


Euthyrox Side Effects 

While undergoing treatment with levothyroxine (Euthyrox), it’s important to be aware of potential side effects and reactions:             

  • Hair Loss: Some individuals may experience hair loss during the initial months of treatment. Typically, this effect is temporary as your body adapts to the medication. If hair loss persists or worsens, it’s advisable to promptly inform your doctor or pharmacist.
  • Risk-Benefit Assessment: Your healthcare provider has prescribed this medication after considering that the benefits outweigh the potential risks of side effects. It’s important to understand that many people using this medication do not experience serious side effects.
  • Alert Your Doctor: If you encounter significant side effects associated with high thyroid hormone levels, such as increased sweating, sensitivity to heat, mood changes (nervousness, mood swings), tiredness, diarrhea, tremors, headache, shortness of breath, bone pain, or an increased risk of bone fractures, you should inform your doctor right away.
  • Seek Immediate Medical Attention: In case of very serious effects related to high thyroid hormone levels, including chest pain, fast or irregular heartbeat, swelling in the hands/ankles/feet, or seizures, it is essential to seek immediate medical assistance.

So, in order to maintain open communication with your healthcare provider is crucial to address any concerns or side effects during your treatment with Euthyrox.

They can provide guidance, monitor your progress, and make any necessary adjustments to your medication as needed.


What to do in case of severe euthyrox allergic reaction?     

While severe allergic reactions to this medication are rare, it’s important to be vigilant.

If you observe any symptoms indicative of a serious allergic reaction, such as a rash, itching, swelling (particularly of the face, tongue, or throat), severe dizziness, or difficulty in breathing, seek immediate medical assistance.

Remember that the list of possible side effects mentioned here is not exhaustive.

If you experience any other effects not mentioned above, it is advisable to contact your doctor or pharmacist for guidance and evaluation.

In the United States, you can report side effects to the FDA at 1-800-FDA-1088 or online at

In Canada, you can reach out to your doctor for medical advice about side effects or report them to Health Canada at 1-866-234-2345.

Prompt reporting of any side effects or adverse reactions can contribute to the safe and effective use of medications.



It’s crucial to emphasize that this medication should not be used for weight loss purposes.

Normal doses of this medication are not effective for weight loss, and attempting to use it for such purposes can lead to serious and potentially fatal side effects, particularly when combined with diet pills.

Levothyroxine (Euthyrox) is prescribed for specific medical conditions, such as hypothyroidism, and should only be taken as directed by your healthcare professional for its intended therapeutic purposes.

Please note that using it inappropriately for weight loss can pose severe health risks.



Before you start taking levothyroxine (Euthyrox) treatment, it’s essential to communicate the following information with your doctor or pharmacist:           

  • Allergies: Please inform your healthcare provider if you are allergic to levothyroxine or if you have any other allergies. This medication may contain inactive ingredients that can trigger allergic reactions or other complications. Consult your pharmacist for more details.
  • Medical History: Provide your doctor or pharmacist with your complete medical history, particularly if you have a history of increased thyroid hormones (thyrotoxicosis), decreased adrenal gland function, heart disease (including coronary artery disease and irregular heartbeat), high blood pressure, or diabetes.
  • Diabetes: If you have diabetes, it’s important to be aware that this medication can impact your blood sugar levels. Regularly monitor your blood sugar as directed and share the results with your doctor. Notify your doctor promptly if you experience symptoms such as increased thirst, increased urination, shakiness, unusual sweating, dizziness, or heightened hunger. Your doctor may need to adjust your diabetes medication, exercise regimen, or diet accordingly.
  • Surgery: Before undergoing surgery, be sure to inform your doctor or dentist about all the products you are using, including prescription drugs, nonprescription drugs, and herbal products.
  • Children: Children may be more sensitive to certain side effects of this drug, such as headache, changes in vision, and hip/leg pain. Elevated thyroid hormone levels can impact bone development and growth, potentially reducing full adult height. It’s important to attend all scheduled lab and medical appointments to allow your doctor to monitor the progress of your treatment.

Sharing this information with your healthcare provider ensures safe and effective use of levothyroxine while accounting for any specific medical conditions or individual sensitivities you may have.


Please check some other precautions while using levothyroxine (Euthyrox):

  • Older Adults: Older adults may be more sensitive to the side effects of this medication, particularly regarding the potential for a fast, pounding, or irregular heartbeat. Close monitoring is advisable for this population.
  • Pregnancy: Levothyroxine can be used during pregnancy, and it is important to inform your doctor if you are pregnant. Your doctor may need to adjust your dosage to ensure that your thyroid function remains stable during pregnancy, as hormonal changes can affect thyroid levels.
  • Breastfeeding: Levothyroxine can pass into breast milk, but it is unlikely to harm a nursing infant. It’s still advisable to consult your doctor before breastfeeding if you are taking this medication, as your healthcare provider can provide guidance on the most appropriate course of action to ensure the well-being of both mother and child.

These considerations underscore the need for open and ongoing communication with your healthcare provider to address any unique factors that may apply to your age group, pregnancy status, or breastfeeding situation while taking levothyroxine



Understanding drug interactions is crucial as they can alter the effectiveness of your medications and potentially elevate the risk of serious side effects. It’s important to be aware that this document does not encompass all possible drug interactions.

To manage your medications safely, consider the following steps:

  • Maintain a List: Keep a comprehensive list of all the products you are using, including prescription and nonprescription drugs, as well as any herbal products or dietary supplements.
  • Share with Healthcare Providers: Regularly share this list with your doctor and pharmacist, so they are informed about all the substances you are taking. This enables them to assess potential interactions and adjust your treatment plan as needed.
  • Consult Your Doctor: Do not initiate, discontinue, or modify the dosage of any medications without first obtaining approval from your doctor. They can provide guidance on how to manage and coordinate your treatments safely.



In the event of an overdose or if someone exhibits severe symptoms like passing out or experiencing difficulty breathing, it is crucial to seek immediate medical assistance. You should call 911 for emergency help.

If the situation is not life-threatening but still involves a potential overdose, it is advisable to contact a poison control center right away.

For residents in the United States, you can reach your local poison control center at 1-800-222-1222. Canadian residents should contact their provincial poison control center.

Symptoms of an overdose may include a fast, pounding, or irregular heartbeat, loss of consciousness, confusion, and seizures. Prompt action is essential to address an overdose and mitigate potential risks and complications.



Proper storage of medications is important to maintain their effectiveness and safety. When it comes to storing levothyroxine (Euthyrox):


  • Room Temperature: Store the medication at room temperature. This typically means keeping it between 68-77°F (20-25°C).
  • Protect from Light and Moisture: Ensure that it is stored in a location away from direct light and moisture. Avoid exposing the medication to excessive heat or humidity.
  • Avoid Storing in the Bathroom: Do not keep the medication in the bathroom, as the fluctuating humidity and temperature in that environment can affect its stability.
  • Keep Out of Reach: Always store medications in a place that is out of the reach of children and pets. Consider using a secure cabinet or storage area.

Hence,  proper storage helps ensure that your medication remains safe and effective throughout its shelf life.


Missed Dose

If you miss a dose of levothyroxine (Euthyrox), follow these guidelines:

  • Take the Missed Dose: If you remember that you’ve missed a dose, take it as soon as you recall.
  • Timing: However, if it’s close to the time for your next scheduled dose, it is recommended to skip the missed dose and take your next dose at the usual time.
  • Do Not Double: Do not double your dose to make up for the missed one, unless your doctor specifically instructs you to do so. Taking an extra dose without medical guidance can lead to adverse effects.
  • Consult Your Doctor: If you miss two or more doses in a row, it is important to contact your doctor. Your healthcare provider can provide specific directions on how to manage missed doses and any necessary adjustments to your treatment plan.

So, always consult your doctor in advance to understand the steps to take in case you miss a dose, and adhere to their specific recommendations to ensure the continuity of your treatment.


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