Euthyrox 12.5 Tablet 100

Merck Ltd

BOTTLE of 100 Units
BOTTLE of 50 Units

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MRP ~~₹158.06~~

₹129.61

₹1.58/Units

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Prescription required for this medicine

Store Below 30° C

Composition

Thyroxine (12.5 Mcg)

Strength:

50 MCG 12.5 MCG 25 MCG 75 MCG 0.088 MG 100 MCG

Euthyrox 12.5 Tablet 100 is used to treat an underactive thyroid (hypothyroidism) by replacing the thyroid hormone the body lacks, restoring normal energy, metabolism and mood, and it is used to help manage goitre.

It contains levothyroxine (thyroxine), a thyroid hormone. It works by replacing the hormone the thyroid gland is not making enough of.

Take it once a day on an empty stomach, at least 30 to 60 minutes before your first meal, at the same time each day. Do not stop it without medical advice, as it is usually a lifelong treatment.

Tell your doctor about any heart problems, diabetes or other medicines before use. Regular blood tests guide the dose. A rapid heartbeat, sweating, shaking or weight loss can mean the dose is too high, so report these promptly.

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Euthyrox 12.5 Tablet 100 is used to treat hypothyroidism in adults and children, including as a low starting dose for gradual titration, and to help manage goitre.

Uses of Euthyrox 12.5 Tablet 100 are:

Hypothyroidism: Replaces or supplements thyroid hormone in an underactive thyroid.
Symptom Relief: Restores normal energy, metabolism and mood.
Goitre: Helps manage certain types of thyroid gland enlargement.

Follow these instructions while taking Euthyrox 12.5 Tablet 100:

Swallow one whole tablet with a full glass of water.
Avoid crushing or chewing the tablet.
Maintain a consistent schedule, taking it at the same time each day.
Consult your doctor before stopping or changing how you consume this medicine.

Euthyrox 12.5 Tablet 100 is taken orally.

Euthyrox 12.5 Tablet 100 may cause some side effects that are usually mild and go away as your body adjusts to the medicine.

A few common side effects of Euthyrox 12.5 Tablet 100:

If the Dose Is Too High: A rapid or irregular heartbeat, sweating, shaking and weight loss; report these promptly.
General: Headache and heat intolerance in some people; your doctor adjusts the dose using blood tests.

If side effects do not improve or become serious, speak to your doctor right away.

Management Of Side Effects:

Most side effects are temporary and generally harmless, which resolve on discontinuing the use of Euthyrox 12.5 Tablet 100. However, if you experience any serious side effects or worsening of any of the symptoms, please consult your doctor.

Here are some tips to manage common side effects:

Headache: Taking the medication at the same time each day, preferably in the morning, may help reduce headaches.
Diarrhoea: Consider taking the medicine on an empty stomach at least 30 minutes before breakfast to minimise this effect.

Euthyrox 12.5 Tablet 100 contains levothyroxine (12.5 Mcg), which works on the body as follows:

Hormone Replacement: Levothyroxine is a synthetic version of the naturally occurring thyroid hormone thyroxine (T4), which replaces the missing hormone in people with hypothyroidism.
Conversion to Active Form: After being absorbed into your bloodstream, levothyroxine is converted into triiodothyronine (T3), the active form of thyroid hormone, by your liver and other tissues.
Cellular Regulation: The converted hormone binds to specific receptors in your body's cells, helping to regulate metabolism, growth, and development.
Metabolic Function: By providing an external source of thyroid hormones, levothyroxine helps restore normal metabolic function when your body cannot produce enough on its own.

Pregnancy

Caution is advised while taking Euthyrox 12.5 Tablet 100 if you are pregnant. It is best to consult your doctor before taking this medicine. Your dosage might need adjustment during pregnancy, as thyroid hormone requirements often change during this time.

Breastfeeding

Exercise caution while taking Euthyrox 12.5 Tablet 100 if you are breastfeeding. It is best to consult your doctor before taking this medicine. Small amounts of levothyroxine may pass into breast milk, but it is generally not harmful to the baby.

Alcohol

Caution is advised when consuming alcohol while taking Euthyrox 12.5 Tablet 100. Alcohol might interfere with how your body processes the medicine. Try to limit or avoid alcohol consumption during your treatment.

Liver

Exercise caution while taking Euthyrox 12.5 Tablet 100 if you have liver problems. The liver plays an important role in converting this medicine to its active form. Your doctor may need to monitor your thyroid levels more frequently if you have liver issues.

Kidney

Caution is advised before using Euthyrox 12.5 Tablet 100 if you have a history of any kidney problems. It is best to consult your doctor before taking this medicine.

Use In Driving And Operating Machinery

You can generally drive and operate machinery while taking Euthyrox 12.5 Tablet 100. However, if you experience dizziness or rapid heartbeat as side effects, avoid these activities until you feel better.

Allergy

Tell your doctor about any allergies you have before starting Euthyrox 12.5 Tablet 100. If you notice symptoms like rash, itching, or swelling after taking this medicine, seek medical help immediately, as these could indicate an allergic reaction.

Children

Caution is advised while giving Euthyrox 12.5 Tablet 100 to children. Always consult your doctor before giving this medicine to a child. Children may need different dosages and more frequent monitoring of thyroid levels.

Older Patients

Older patients should take this medication under medical supervision, as they may be more sensitive to its effects. Your doctor might start with a lower dose and gradually increase it. Regular monitoring of thyroid function is especially important for older adults.

Drug-Drug Interactions

Euthyrox 12.5 Tablet 100 can interact with the following medicines:

Calcium and iron supplements: These minerals, including calcium carbonate and ferrous sulphate, can significantly reduce the absorption of levothyroxine when taken at the same time.
Antidepressants: Medicines like sertraline and fluoxetine may alter the effectiveness of Euthyrox 12.5 Tablet 100, potentially requiring dosage adjustments.
Blood thinners: Warfarin and heparin may have enhanced effects when taken with Euthyrox 12.5 Tablet 100, potentially increasing the risk of bleeding.
Diabetes medicines: Metformin and insulin requirements may change when taking Euthyrox 12.5 Tablet 100, as thyroid hormones affect blood glucose levels.

Drug-Food Interactions

Euthyrox 12.5 Tablet 100 may interact with several foods that can reduce its absorption.

Soy products: Soy milk and tofu may interfere with levothyroxine absorption.
High-fibre foods: Whole grains and bran may reduce the effectiveness of Euthyrox 12.5 Tablet 100.
Walnuts: These nuts may decrease the absorption of the medicine.

Drug-Disease Interactions

Euthyrox 12.5 Tablet 100 can interact with the following diseases:

Untreated adrenal insufficiency: Taking Euthyrox 12.5 Tablet 100 without treating this condition first can trigger a dangerous adrenal crisis.
Acute myocardial infarction: Patients with recent heart attacks should use this medication with warning as it may worsen cardiac symptoms.
Diabetes: Euthyrox 12.5 Tablet 100 can affect blood sugar control, potentially requiring adjustments to diabetes medicine dosages.

Daily Dose

The daily dose of Euthyrox 12.5 Tablet 100 should be taken as prescribed by your doctor. The dosage may change based on individual factors such as age, weight, and severity of your condition. Follow the prescribed dosage without making changes unless your doctor advises.

Over Dose

Taking too much Euthyrox 12.5 Tablet 100 may cause headache, rapid heartbeat, excessive sweating, increased appetite, weight loss, and diarrhoea. If you experience these symptoms after taking more than prescribed, consult your doctor promptly.

Missed Dose

If you forget to take the medication, take it as soon as you remember. If it's nearly time for your next dose, skip the missed one and continue your regular schedule. Never take a double dose to make up for a missed one.

Keep away from moisture, heat, and direct light.
Store in the original packaging to protect from environmental exposure.
Keep out of reach of children.
Check the expiry date before use and discard any expired medicine.
Close the container tightly after each use.

Maintain consistent meal times and eating patterns to help regulate your metabolism if you have hypothyroidism, as this helps your body better utilise thyroid hormones.
Take calcium or iron supplements at least 4 hours apart from your Euthyrox 12.5 Tablet 100 dose, as these minerals can interfere with proper absorption of levothyroxine.

Fact Box

Dosage Forms Available	Tablet
Habit Forming	No
Ailment	Hypothyroidism, goitre, hormone imbalance
Drug Category	Thyroid hormone replacement
Therapeutic Category	Hypothyroidism treatment

What if I miss a dose of Euthyrox 12.5 Tablet 100?

Take it when you remember. If it's almost time for your next dose, skip the missed one. Never take a double dose to catch up.

How long does it take for Euthyrox 12.5 Tablet 100 to start working?

You might not notice changes immediately. It may take 2-4 weeks for your body to respond, with full effects appearing within 1-3 months.

Can I stop taking Euthyrox 12.5 Tablet 100 once my symptoms improve?

No. Hypothyroidism (underactive thyroid) typically requires lifelong management. Stopping could cause your symptoms to return, sometimes severely.

Are there dietary restrictions while taking Euthyrox 12.5 Tablet 100?

Avoid calcium, iron supplements, and soy products within 4 hours of taking Euthyrox 12.5 Tablet 100.

Can Euthyrox 12.5 Tablet 100 be used for weight loss?

No. This medicine replaces missing thyroid hormones in patients with hypothyroidism. It's not a weight loss product and shouldn't be misused this way.

Will Euthyrox 12.5 Tablet 100 interact with my other medicines?

Yes, several medicines can interact with levothyroxine. Always inform your doctor about the other medications you take, including supplements and herbal products.

How should I store Euthyrox 12.5 Tablet 100?

Keep at room temperature away from moisture, heat and direct light. Store in the original packaging and keep out of reach of children.

Last Updated On 11 Sep. 2026 | 3:05AM (IST)

Certified Content

Written by

Ashmita Borgohain

Medical Content Writer | 14 years

MSc (Applied Genetics)

Reviewed by

Dr. Chhavi Rosha

Medical Content Writer | 10 years

BAMS, FMC, MD Resident

Check out Editorial Policy

Manufacturer details

Godrej One, 8th floor, Pirojsha Nagar,, Eastern Express Highway,, Vikroli East, Mumbai, Maharashtra 400079

Country of origin: INDIA

Expiry on or after: January 2027

In case of any issues, contact us:

support@truemeds.in|09240250346

Address: 6th floor, Urmi Corporate Park Solaris, Saki Vihar Road, Andheri East, Mumbai 400071

References

Levothyroxine: MedlinePlus drug information. (n.d.). https://medlineplus.gov/druginfo/meds/a682461.html
Eghtedari, B., & Correa, R. (2023, August 28). Levothyroxine. StatPearls - NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK539808/
PubChem. (n.d.-v). Levothyroxine. PubChem. https://pubchem.ncbi.nlm.nih.gov/compound/Levothyroxine
NHS. (n.d.). Levothyroxine. NHS. Retrieved from https://www.nhs.uk/medicines/levothyroxine/
DailyMed - LEVOTHYROXINE SODIUM tablet. (n.d.). https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=e95720f2-91c9-a6d0-f7d5-8bcb94d07bbc
U.S. Food and Drug Administration. (1982). NDA 085755: Synthroid (levothyroxine sodium tablets, USP). https://www.accessdata.fda.gov/drugsatfda_docs/nda/pre96/085755.pdf

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We, at Truemeds make a diligent attempt to deliver accurate, expert- drafted and thoroughly reviewed medicine related information to our consumers. However, it should, by no means, be considered a substitute for prescription from a certified doctor or a trustworthy doctor-patient relationship. In fact we detest any form of self medication without expert advice. The sole purpose of the information on our portal is to educate our consumers, which helps improve the communication between a doctor and a patient. The information by no means is complete in its entirety and should not be used to diagnose or treat any medical condition. No amount of information can replace the experience and expertise of a doctor, therefore his/her advice always holds priority and should be followed appropriately.

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CIN: U62099MH2019PTC320566

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