Thyrox

Tablet · Macleods
PRESCRIPTION MEDICINE

Thyrox is a tablet made by Macleods that contains Levothyroxine several strengths. Levothyroxine is a thyroid hormone: replaces thyroid hormone in an underactive thyroid (hypothyroidism).

Ingredient (salt)Amount
Levothyroxineseveral strengths

What it is used for

Replaces thyroid hormone in an underactive thyroid (hypothyroidism).

How it works

A synthetic copy of the thyroid hormone T4, replacing what an underactive thyroid cannot make.

How to take it

Take once a day on an empty stomach with water, 30 to 60 minutes before breakfast and tea or coffee, at the same time daily. Blood tests (TSH) guide the dose; it takes 6 weeks to settle after a change.

Common side effects

Usually none at the right dose. Too much: palpitations, sweating, weight loss, anxiety, trouble sleeping

Get medical help straight away if

Chest pain, very fast or irregular heartbeat

Be careful

Take on an empty stomach, 30 to 60 minutes before breakfast; keep away from calcium and iron.

Other medicines and interactions

Iron, calcium, antacids, PPIs, soy and fibre supplements reduce absorption; separate by 4 hours. Can change warfarin and diabetes medicine needs.

Pregnancy and breastfeeding

Essential to continue in pregnancy; the dose often needs to go up early, so tell your doctor as soon as you are pregnant. Safe while breastfeeding.

Same ingredients, different strength or form

ThyronormEltroxin

Common questions

What is Thyrox?

Thyrox is a tablet by Macleods containing Levothyroxine several strengths.

What is Thyrox used for?

Replaces thyroid hormone in an underactive thyroid (hypothyroidism).

How should I take Thyrox?

Take once a day on an empty stomach with water, 30 to 60 minutes before breakfast and tea or coffee, at the same time daily. Blood tests (TSH) guide the dose; it takes 6 weeks to settle after a change. Always follow the dose your doctor or the pack gives.

What are the side effects of Thyrox?

Common side effects include: Usually none at the right dose. Too much: palpitations, sweating, weight loss, anxiety, trouble sleeping. Get medical help straight away for: Chest pain, very fast or irregular heartbeat.

Does Thyrox need a prescription?

Yes. In India it is a prescription (Schedule H) medicine, so a pharmacist should sell it only with a doctor's prescription.

Can I take Thyrox in pregnancy or while breastfeeding?

Essential to continue in pregnancy; the dose often needs to go up early, so tell your doctor as soon as you are pregnant. Safe while breastfeeding.

What are the substitutes for Thyrox?

We have no other brand with exactly the same composition and strength in our list yet. Ask your pharmacist for an equivalent.

Sources and further reading

NHS (UK National Health Service) and MedlinePlus (US National Library of Medicine) are free, reviewed medicine guides. Brand names and doses there may differ from India.

Composition checked against pack details from large Indian online pharmacies. Last reviewed 31 October 2026. Written by Satya Babu.

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For information only, not medical advice. This page is a plain-language summary written from standard prescribing information and the public guides linked below. Brands sometimes change their formula, so always check the composition printed on the pack. Doses here are typical adult doses; yours may differ. Do not start, stop or change a medicine without your doctor or pharmacist, and keep all medicines away from children. In an emergency, call 112 (India) or your local emergency number.