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
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
No. Euthyrox 100mcg Tablet is a non-prescription product and can be ordered without a prescription. It is still dispensed by a registered pharmacist on DoctorOnCall.
Euthyrox 100mcg Tablet is a tablet containing Levothyroxine Sodium 100mcg. The full ingredient list is shown in the Composition or Ingredients section on this page and on the product packaging.
It is supplied in pack sizes of 100s and 25s. Choose the pack size you need from the options shown on this page before adding the item to your cart.
This page is limited to product, safety and handling information in line with Malaysian rules on medicine information. If you want advice on whether this product suits you, book an online consultation with a doctor or pharmacist on DoctorOnCall.
Follow the instructions printed on the label and in the leaflet supplied with the pack, and do not exceed the stated amount or duration. Handling steps are set out in the Directions for Use section on this page.
Yes. DoctorOnCall offers online consultations with licensed doctors and registered pharmacists, so you can ask about this product, your existing medicines, or anything on the label before you place an order.
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. Keep it in its original pack and do not use it after the expiry date printed on the packaging.
Stop using the product and speak to a doctor or pharmacist about any reaction that concerns you. Seek medical care immediately for signs of a severe reaction such as difficulty breathing, swelling of the face, lips or throat, or a widespread rash. Reported reactions are listed in the Side Effects section on this page.
Within Malaysia, standard delivery takes 3 to 5 working days. Same-day delivery is available in the Klang Valley for orders placed before 12pm; orders placed after 12pm arrive by the end of the next day.
Orders to Singapore are sent as international deliveries and take 5 to 9 working days. A lump-sum shipping and handling fee applies to every overseas delivery and is shown at checkout.
Customers in Malaysia can pay by FPX online banking, credit or debit card (Visa and Mastercard), and supported e-wallets including Touch ‘n Go eWallet, GrabPay and ShopeePay.
FPX and local e-wallets are tied to Malaysian bank and wallet accounts, so if your delivery address is in Singapore, use the payment options displayed at checkout for that address rather than assuming the same list applies.
Yes. DoctorOnCall ships to Singapore as an international order dispatched from Malaysia, arriving in 5 to 9 working days with a lump-sum shipping and handling fee.
Singapore’s Health Sciences Authority (HSA) allows personal imports of up to three months’ supply of a medicine for your own use or an immediate family member’s, as long as it contains no controlled drugs, psychotropic substances or prohibited items. Keep the product in its original labelled packaging and keep a copy of your prescription or doctor’s letter with it. Quantities above three months’ supply, and medicines containing controlled substances, require prior HSA approval.
Products listed on DoctorOnCall are registered with Malaysia’s Ministry of Health for supply in Malaysia, and each pack carries its MAL registration number.
An order delivered to Singapore arrives as a personal import of a Malaysia-registered product; HSA product registration is not required for personal-use quantities, but it is also not the same as a product registered for sale in Singapore. If you need a locally registered Singapore product, buy it from a pharmacy in Singapore.
DoctorOnCall’s customer care team handles order, delivery and product queries through the contact channels on the site, including WhatsApp and the online help centre.
For deliveries to Singapore, allow more time before chasing an order than you would for a local Malaysian delivery, as the parcel passes through customs clearance and tracking updates can appear later in the journey.
Euthyrox 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.
What condition or symptom are you treating with this medication?
Please select your condition / symptom before adding to cart.
*Please select the closest match. A pharmacist may call to verify your selection before dispensing.
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.
Please tick this box to confirm you are 18+ before adding to cart.
IMPORTANT: Unsure? Chat with our pharmacists (Mon - Sat, 9:00am - 6:00pm) before buying.