Do I need a prescription to buy Euthyrox 25mcg Tablet?

No. Euthyrox 25mcg Tablet is a non-prescription product and can be ordered without a prescription. It is still dispensed by a registered pharmacist on DoctorOnCall.

What does Euthyrox 25mcg Tablet contain?

Euthyrox 25mcg Tablet is a tablet containing Levothyroxine Sodium 25mcg. The full ingredient list is shown in the Composition or Ingredients section on this page and on the product packaging.

What pack sizes does Euthyrox 25mcg Tablet come in?

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.

Why is there no information here about what Euthyrox 25mcg Tablet is for?

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.

How should I use Euthyrox 25mcg Tablet?

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.

Can I speak to a doctor or pharmacist about Euthyrox 25mcg Tablet before I buy it?

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.

What should I do if I notice side effects after using Euthyrox 25mcg Tablet?

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.

How long will delivery take?

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.

What payment methods can I use?

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.

Can Euthyrox 25mcg Tablet be delivered to Singapore?

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.

Is Euthyrox 25mcg Tablet registered with the authorities?

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.

Who do I contact if there is a problem with my order?

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 25mcg Tablet levothyroxine hypothyroidism thyroid | DoctorOnCall Malaysia

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Euthyrox 25mcg Tablet

Brand Merck

Manufacturer Merck

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Reviewed byDr. Mohd Izzat Amir Bin AwangDoctor of Medicine (MD), University of Mansoura - Manchester

Written byDr. Adeline Carol PetersBachelor of Medicine and Bachelor of Surgery (MBBS) — Manipal Academy of Higher Education (MAHE)

Last updated: October 31, 2026

Overview

Euthyrox 25mcg Tablet contains Levothyroxine Sodium 25mcg and is presented as a tablet. It is supplied in pack sizes of 100s and 25s.

It is classified as a non-prescription medicine, so no prescription is needed to order it. Under Malaysian rules for medicine information, this page carries product, safety and handling information only.

You can consult a doctor or pharmacist online on DoctorOnCall about this product before or after you order. Every order is checked by a registered pharmacist before it is delivered. Always read the label and the leaflet supplied with the pack.

Directions for Use

Euthyrox 25mcg Tablet should be taken exactly as prescribed, typically once daily in the morning on an empty stomach, at least 30 minutes before breakfast or other medicines, and swallowed whole with a full glass of water. Because this is often a starting or titration dose, patients should not adjust the dose themselves even if they feel no immediate difference, since thyroid hormone levels take weeks to stabilise and dose changes are guided by blood test results.

Dosage

The 25mcg strength is typically used as an initial or low starting dose, particularly in elderly patients or those with cardiac risk factors, and the doctor will usually plan to reassess thyroid function tests after several weeks before deciding whether to increase the dose in small steps. The exact dose and any planned increases are individualised by the prescribing doctor and should never be changed without medical review of blood test results.

Storage Instructions

Store below 25°C in a dry place, protected from light and moisture, and keep the tablets in their original blister packaging until needed. Keep out of the sight and reach of children.

Side Effects

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

Contraindications

Known hypersensitivity to levothyroxine or any excipient in the tablet
Untreated adrenal insufficiency or untreated pituitary insufficiency, unless managed concurrently
Untreated overactive thyroid (thyrotoxicosis)
Acute heart attack, acute inflammation of the heart muscle, or acute inflammation of all layers of the heart, unless specifically directed by a cardiologist
Not to be self-initiated without a doctor’s prescription and monitoring plan

Drug / Food Interactions

Calcium supplements, iron supplements, and antacids containing aluminium or magnesium — these can reduce levothyroxine absorption if taken too close together; space doses by at least 4 hours
Proton pump inhibitors and certain cholesterol-lowering resins, which may also reduce absorption
Oral anticoagulants (blood thinners) — levothyroxine may enhance their effect, requiring closer monitoring
Oestrogen-containing medicines, which can affect thyroid hormone binding and dose requirements
Food, particularly high-fibre meals or soy products taken too close to the dose, which may reduce absorption

Quick Tips

Take Euthyrox 25mcg Tablet at the same time each morning, on an empty stomach, for consistent absorption
Keep to your scheduled blood test appointments, as dose adjustments are based on these results, not on symptoms alone
Do not switch between different levothyroxine brands or strengths without your doctor’s knowledge
Report new chest pain, palpitations, or unusual anxiety promptly, especially if you have a heart condition
Be patient — this low starting dose is often just the first step in a gradual titration plan

Ingredients / Active Ingredients

Levothyroxine

Levothyroxine Sodium 25mcg (active ingredient)
Microcrystalline cellulose and other standard tablet excipients
Citric acid as a stabiliser, as used in the branded formulation
Colouring agents specific to the 25mcg tablet strength for easy identification

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

Because Euthyrox 25mcg Tablet is frequently used as a cautious starting point rather than a final maintenance dose, patients should expect their doctor to review thyroid function tests periodically and adjust the dose upward in small increments if needed. This gradual approach is particularly important in older adults and those with pre-existing heart disease, where a too-rapid increase in thyroid hormone can place extra strain on the heart.

Frequently Asked Questions

Product Specifications

Brand	Merck
Manufacturer	Merck
Classification	Non-prescription
Ingredients / Active Ingredients	Levothyroxine
Pack Size	100s, 25s
Shelf Life	Euthyrox 25mcg Tablet is generally stable until the expiry date printed on the blister strip or carton when stored correctly. Do not use tablets beyond the printed expiry date.