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EUthyrox 100 Tablet

Levothyroxine (100mcg)
Genuine
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NPPA Regulated
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EUthyrox 100 Tablet is a medicine used in the treatment of hypothyroidism. It works by replacing or supplementing the thyroid hormone in the body. This helps regulate metabolism, energy levels, and overall bodily functions.

Written By Dr. Lipika Khurana, PGDHHM, BDS,
Reviewed By Dr. Rajeev Sharma, MBA, MBBS,
Last updated on 29 Apr 2026 | 01:01 PM (IST)
₹135 MRP ₹140.634% off 
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General Information

The content is shown in English
EUthyrox 100 Tablet image
EUthyrox 100 Tablet image
EUthyrox 100 Tablet image
EUthyrox 100 Tablet image

Product introduction

EUthyrox 100 Tablet is to be taken on an empty stomach, at least 30 minutes before breakfast, with a full glass of water. Take it exactly as prescribed by your doctor. Consistency in timing and dosage helps maintain stable hormone levels in the body. Avoid taking it with calcium, iron supplements, or antacids, as these can interfere with absorption. Follow up with your doctor regularly to monitor the effectiveness of the medicine and to make necessary dose adjustments if required.


Common side effects of EUthyrox 100 Tablet include headaches, nervousness, weight loss, insomnia, shortness of breath, and diarrhea. These effects usually occur if the dose is too high. If you experience symptoms like chest pain, rapid heartbeat, or excessive weight loss, inform your doctor immediately. To minimize side effects, take the medication exactly as prescribed and do not change the dose on your own.


EUthyrox 100 Tablet should not be used in cases of untreated adrenal gland problems, overactive thyroid, or severe heart conditions without your doctor’s supervision. Pregnant and breastfeeding women should consult their doctor, as dose adjustments may be necessary. Avoid taking excessive amounts of caffeine or soy-based products, as they may affect the drug’s absorption. Always inform your doctor about any other medications you are taking to prevent harmful interactions.

Uses of EUthyrox Tablet

Benefits of EUthyrox Tablet

Hypothyroidism
Hypothyroidism is a condition where the thyroid gland does not produce enough thyroid hormones, leading to symptoms like tiredness, weight gain, and sensitivity to cold. EUthyrox 100 Tablet supplies the missing thyroid hormone, helping to restore normal body metabolism, energy levels, and overall well-being.

Side effects of EUthyrox Tablet

Most side effects do not require any medical attention and disappear as your body adjusts to the medicine. Consult your doctor if they persist or if you’re worried about them
Common side effects of EUthyrox
  • Arrhythmia (irregular heartbeats)
  • Headache
  • Irritability
  • Tremors
  • Muscle weakness
  • Weight loss
  • Diarrhea
  • Heat intolerance
  • Skin rash
  • Increased appetite
  • Irregular menstrual cycle
  • Insomnia (difficulty in sleeping)
  • Heart attack
  • Breathlessness
  • Muscle spasm

How to use EUthyrox Tablet

Take this medicine in the dose and duration as advised by your doctor. Swallow it as a whole. Do not chew, crush or break it. EUthyrox 100 Tablet is to be taken on an empty stomach.

How EUthyrox Tablet works

EUthyrox 100 Tablet is a synthetic version of a hormone produced by the thyroid gland. It works by replacing the thyroid hormones that your thyroid gland cannot produce. This leads to improved energy production, oxygen consumption, protein synthesis, and overall regulation of metabolism, helping restore normal thyroid function and physiological balance.

Quick tips

  • Always take EUthyrox 100 Tablet at least 30 minutes before breakfast with a full glass of water to ensure proper absorption.
  • Take your dose at the same time every day to maintain stable thyroid hormone levels in your body.
  • Avoid certain foods and supplements such as calcium, iron supplements, soy products, and antacids as they can interfere with absorption.
  • Keep track of how you feel, and report symptoms like fatigue, weight changes, or palpitations to your doctor for possible dose adjustments.
  • Don’t skip or adjust the dose on your own, as missing doses or changing the dosage without medical advice can lead to imbalanced thyroid levels and unwanted side effects.

Safety advice

Alcohol

Alcohol

CONSULT YOUR DOCTOR
It is not known whether it is safe to consume alcohol with EUthyrox 100 Tablet. Please consult your doctor.
Pregnancy

Pregnancy

SAFE IF PRESCRIBED
EUthyrox 100 Tablet is generally considered safe to use during pregnancy. Animal studies do not indicate harmful effects. However, there are limited human studies.
Breast feeding

Breast feeding

SAFE IF PRESCRIBED
Available human data suggest that the drug does not pass into breast milk in clinically significant amounts and is unlikely to harm the infant.
Driving

Driving

SAFE
EUthyrox 100 Tablet does not usually affect your ability to drive.
Kidney

Kidney

CONSULT YOUR DOCTOR
There is limited data available on the use of EUthyrox 100 Tablet in patients with kidney disease. Please consult your doctor.
Liver

Liver

CAUTION
EUthyrox 100 Tablet should be used with caution in patients with liver disease. Dose adjustment may be needed.

Interaction with drugs

Taking EUthyrox with any of the following medicines can modify the effect of either of them and cause some undesirable side effects
Moderate

Indinavir (Oral Route)

Talk to your doctor if you notice any unusual symptoms. Indinavir may increase the side effects of Levothyroxine.
Moderate

Linezolid (Oral Route)

Talk to your doctor if you notice any unusual symptoms.Doctor may monitor your liver function. Levothyroxine may increase the metabolism of Linezolid.
Moderate

Linezolid (Injection Route)

Talk to your doctor if you notice any unusual symptoms.Doctor may monitor your liver function. Levothyroxine may increase the metabolism of Linezolid.
Moderate

Ritonavir (Oral Route)

Talk to your doctor if you notice any unusual symptoms.Doctor may monitor your liver function. Ritonavir may reduce blood levels and efficacy of the active form of Levothyroxine.
Moderate

Linezolid (Oral Route)

Talk to your doctor if you notice any unusual symptoms.Doctor may monitor your liver function. Levothyroxine may increase the metabolism of Linezolid.

Frequently asked questions

Take EUthyrox 100 Tablet on an empty stomach with a full glass of water. Avoid taking it with calcium, iron, or antacids, as they can interfere with absorption.
Avoid EUthyrox 100 Tablet if you have untreated adrenal or thyroid disorders, recent heart issues, or an allergy to any of its ingredients. Pregnant women should not use it alongside antithyroid medications.
If you miss a dose, take it as soon as you remember. If it is close to your next scheduled dose, skip the missed dose and continue with your regular schedule. Do not take two doses at once.

Fact Box

Chemical Class

Iodinated Amino Acid Derivative

Habit Forming

No

Therapeutic Class

HORMONES

Action Class

Thyroid Hormones
100% genuine products
100% genuine products
Safe & secure payments
Safe & secure payments
No contact delivery
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Fully sanitized facilities
Fully sanitized facilities

User feedback

Once A Day
98%
Twice A Day
1%
Hypothyroidism
100%
Excellent
44%
Average
33%
Poor
22%
No Side Effect
100%
Empty stomach
100%
Expensive
42%
Average
33%
Not Expensive
25%
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Disclaimer

Tata 1mg's sole intention is to ensure that its consumers get information that is expert-reviewed, accurate and trustworthy. However, the information contained herein should NOT be used as a substitute for the advice of a qualified physician. The information provided here is for informational purposes only. This may not cover everything about particular health conditions, lab tests, medicines, all possible side effects, drug interactions, warnings, alerts, etc. Please consult your doctor and discuss all your queries related to any disease or medicine. We intend to support, not replace, the doctor-patient relationship.

Marketer details

Name: Merck Ltd
Address: L-2, J.R. Complex, Gate No. 4, Village Mandoli, Delhi-110 093, India

Vendor Details

Country of origin: India
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