Euthyrox 100mcg Tablet

Brand Merck
Manufacturer Merck
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Dr. Mohd Izzat Amir Bin Awang
Reviewed byDr. Mohd Izzat Amir Bin AwangDoctor of Medicine (MD), University of Mansoura - Manchester
Dr. Adeline Carol Peters
Written byDr. Adeline Carol PetersBachelor of Medicine and Bachelor of Surgery (MBBS) — Manipal Academy of Higher Education (MAHE)

Last updated:

Overview

Euthyrox 100mcg Tablet is a tablet with Levothyroxine Sodium 100mcg declared as its active content. It is supplied in pack sizes of 100s and 25s.

This is a non-prescription product and can be purchased without a prescription. Only product, safety and handling details are published on this page.

An online consultation with a DoctorOnCall doctor or pharmacist is available for this product, and a registered pharmacist reviews each order before dispatch to Malaysia or Singapore. Follow the directions on the label and on the leaflet inside the pack.

Directions for Use

Euthyrox 100mcg Tablet should be taken exactly as prescribed by the doctor, typically once daily on an empty stomach, at least 30 to 60 minutes before breakfast, with a full glass of water, to ensure consistent absorption. It should be taken at the same time each day, and other medicines, supplements (particularly calcium, iron, or antacids), or food should generally be taken several hours apart, as they can interfere with absorption.

Dosage

The dose of Euthyrox 100mcg Tablet is individualised by the prescribing doctor based on regular thyroid function blood tests (TSH, free T4) and clinical response, and should never be adjusted or stopped without medical advice. Changes in dose typically take several weeks to show their full effect on thyroid hormone levels, so blood tests are usually repeated after any dose change before further adjustments are made.

Storage Instructions

Store Euthyrox 100mcg Tablet below 25°C in a dry place, away from direct sunlight and moisture, as levothyroxine can be sensitive to heat and humidity. Keep tablets in their original blister packaging until ready for use, and keep out of the reach of children.

Side Effects

  • Headache
  • Nervousness or anxiety
  • Sleeplessness (insomnia)
  • Increased appetite
  • Weight loss
  • Sweating
  • Palpitations or rapid heartbeat
  • Menstrual irregularities

Contraindications

  • Untreated thyrotoxicosis (overactive thyroid)
  • Untreated adrenal insufficiency (must be corrected before starting levothyroxine)
  • Untreated pituitary insufficiency affecting adrenal function
  • Acute myocardial infarction or uncontrolled cardiac arrhythmias
  • Known hypersensitivity to levothyroxine sodium or any component of the tablet

Drug / Food Interactions

  • Calcium carbonate, iron supplements, and antacids can reduce absorption if taken too close together
  • Certain cholesterol-lowering medicines (e.g. cholestyramine) can reduce absorption
  • Oestrogen-containing medicines and some anticonvulsants can affect thyroid hormone requirements
  • Soy products and high-fibre meals may reduce absorption if taken at the same time
  • Inform your doctor of all other medicines and supplements you are taking

Quick Tips

  • Take Euthyrox on an empty stomach, at least 30 to 60 minutes before food, at the same time each day
  • Separate other medicines and supplements, especially calcium and iron, by at least 4 hours
  • Attend all scheduled thyroid function blood tests so your doctor can fine-tune your dose
  • Do not stop or change your dose without medical advice, even if you feel well
  • Report symptoms of both overtreatment (palpitations, tremor) and undertreatment (fatigue, weight gain) to your doctor

Ingredients / Active Ingredients

  • Levothyroxine Sodium 100mcg

Safety Advice

Pregnancy

Safe If Prescribed

This medicine should only be used during pregnancy if prescribed by a doctor after careful evaluation.

Breastfeeding

Generally Safe

This medicine is generally safe during breastfeeding with minimal risk to the infant.

Kidney

Use With Care

Use cautiously. Dose adjustment or monitoring may be required.

Liver

Safe If Prescribed

Use only if prescribed, with possible monitoring.

Alcohol

Use With Care

Caution is advised when consuming alcohol with this medicine.

Driving

Generally Safe

This medicine is generally safe and should not impair your driving ability.

Relevant Information

Euthyrox is a long-term, often lifelong replacement therapy for hypothyroidism, and consistency in how and when it is taken is essential for stable thyroid hormone levels. Patients should inform their doctor before switching between different levothyroxine brands, as slight differences in formulation can occasionally affect absorption, and should have thyroid function rechecked after any brand change.

Frequently Asked Questions

Product Specifications

BrandMerck
ManufacturerMerck
ClassificationNon-prescription
Ingredients / Active IngredientsLevothyroxine
Pack Size100s, 25s
Shelf LifeEuthyrox 100mcg Tablet should be used before the expiry date printed on the blister strip and outer carton. Do not use the tablets beyond this date, as their potency cannot be guaranteed thereafter.

Customer Reviews

4.8 · 10 reviews
  • Verified purchase

    Nur Maisarah · Purchased: 25s

    very recommended to buy this and very cheap

  • Verified purchase

    Afiqah Nordin · Purchased: 25s

    Received in good condition well packed

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Important Medical Information

💊 Recommended Dosage:

The dose of Euthyrox 100mcg Tablet is individualised by the prescribing doctor based on regular thyroid function blood tests (TSH, free T4) and clinical response, and should never be adjusted or stopped without medical advice. Changes in dose typically take several weeks to show their full effect on thyroid hormone levels, so blood tests are usually repeated after any dose change before further adjustments are made.

🛑 Contraindications (Do not use if):
  • Untreated thyrotoxicosis (overactive thyroid)
  • Untreated adrenal insufficiency (must be corrected before starting levothyroxine)
  • Untreated pituitary insufficiency affecting adrenal function
  • Acute myocardial infarction or uncontrolled cardiac arrhythmias
  • Known hypersensitivity to levothyroxine sodium or any component of the tablet
If you are unsure, please chat with us or consult your doctor.
⚠️ Common Side Effects:
  • Headache
  • Nervousness or anxiety
  • Sleeplessness (insomnia)
  • Increased appetite
  • Weight loss
  • Sweating
  • Palpitations or rapid heartbeat
  • Menstrual irregularities
Stop taking this medication immediately and consult your doctor if you experience severe allergic reactions or side effects.
IMPORTANT: Unsure? Chat with our pharmacists (Mon - Sat, 9:00am - 6:00pm) before buying.