Thyronex 50 Tablet

Reviewed By Dr. Sachin Gupta, MD Pharmacology, MBBS

Last updated on 07 Jan 2026 | 03:32 PM (IST)

Thyronex 50 Tablet is a medicine used to treat an underactive thyroid gland (hypothyroidism). It replaces the hormone which is not being produced by your thyroid gland in sufficient quantity and helps regulate your body’s energy and metabolism.

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General Information

Contains

Thyroxine (50mcg)

Marketer

Zeelab Pharmacy Pvt Ltd

Storage

Store below 25°C

The content is shown in English

Product introduction

Before you start taking Thyronex 50 Tablet, your doctor will do a blood test to see what dose you need. Once you start taking the medicine, you will have regular blood tests to see how well it is working, and the dose may be adjusted from time to time. It is best taken on an empty stomach before your first meal of the day. You should take this medicine regularly to get the maximum benefit. It may take several weeks before your symptoms start to improve. You may need to take it for the rest of your life. If you stop taking it, your symptoms are likely to come back.

The most common side effects of this medicine are caused by taking a higher dose than you need. Possible side effects include palpitations (irregular heartbeat), vomiting, anxiety, diarrhea, weight loss, tremors, increased appetite, and restlessness. Most side effects will disappear once you are on the right dose. Call your doctor straight away if you have a very high temperature, fast or irregular heart rate, low blood pressure, yellowness in the eye/skin, confusion, or fits.

Thyronex 50 Tablet may cause weight loss but should not be prescribed or taken to treat obesity. If you become pregnant while taking this medicine, inform your doctor right away as the dose may have to be increased/readjusted. Many other drugs affect the way this medicine works. Ask your doctor for advice if you are taking any other medications.

Uses of Thyronex Tablet

Hypothyroidism

Benefits of Thyronex Tablet

Hypothyroidism
Thyronex 50 Tablet is used to treat hypothyroidism by restoring normal levels of thyroid hormone in the body. It helps improve energy levels, metabolism, mood, and other body functions that may be affected by an underactive thyroid gland.

Side effects of Thyronex 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 Thyronex

Electrolyte imbalance
Dizziness
Fatigue
Muscle cramp
Headache

How to use Thyronex 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. Thyronex 50 Tablet is to be taken on an empty stomach.

How Thyronex Tablet works

Thyronex 50 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 in a sufficient quantity, and relieves the symptoms of hypothyroidism (tiredness, weight gain, and depression).

All substitutes for Thyronex 50 Tablet

For information purposes only. Consult a doctor before taking any medicine.

Quick tips

Thyronex 50 Tablet should be taken on an empty stomach (ideally, first thing in the morning). No food, milk, or tea should be taken 1 hour before and 2 hours after taking this medicine.
It may take 6 to 8 weeks to get the full effect.
For most people, Thyronex 50 Tablet can be a lifelong medication. Do not discontinue it without discussing your doctor.
Inform your doctor if you have diarrhea, nervousness, irritability, sleep disturbances, shaking hands, or chest pain. Your doctor may adjust your dose.
Leave a gap of at least 4 hours before taking any antacids, calcium or iron supplements, and multivitamins, as these may interfere with the effect of the medicine.
Get your hormone levels checked regularly and inform your doctor if you notice a significant change in your body weight. The dose may need to be adjusted.
Inform your doctor before changing the brand of Thyronex 50 Tablet as all brands may not have the same effect.

Safety advice

Alcohol

SAFE

Consuming alcohol with Thyronex 50 Tablet does not usually cause any harmful side effects.

Pregnancy

SAFE IF PRESCRIBED

Thyronex 50 Tablet is safe to use during pregnancy. Most studies have shown low or no risk to the developing baby.

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

SAFE

Thyronex 50 Tablet does not usually affect your ability to drive.

Kidney

CONSULT YOUR DOCTOR

There is limited data available on the use of Thyronex 50 Tablet in patients with kidney disease. Please consult your doctor.

Liver

CONSULT YOUR DOCTOR

There is limited data available on the use of Thyronex 50 Tablet in patients with liver disease.

Interaction with drugs

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

Moderate

Allylestrenol (Oral Route)

If concurrent use is essential, your doctor may monitor your thyroid functioning closely along with your overall treatment and adjust the doses as per the observations.

Moderate

Amiodarone (Oral Route)

Do not consume Thyroxine with Amiodarone. If concurrent use is essential, your doctor may monitor your thyroid functioning closely along with your overall treatment and adjust the doses as per the observations. Amiodarone may reduce blood levels of Thyroxine and its active form.

Moderate

Amiodarone (Injection Route)

Moderate

Atazanavir (Oral Route)

If concurrent use is essential, please consult your doctor, they may monitor your thyroid function closely along with your overall treatment and adjust the doses as per the observations. Atazanavir may reduce the efficacy of Thyroxine.

Moderate

Calcium (Oral Route)

Ensure a gap of at least 4 hours between taking Thyroxine and Calcium. Thyroxine may increase the effect of Calcium.

Frequently asked questions

What should I do if I accidentally take more than the dose required?

An overdose of this medicine may cause nervousness, anxiety, rapid heartbeat, hand tremors, excessive sweating, weight loss, and sleep problems. You should immediately consult your doctor in case of an overdose.

How long do I need to take Thyronex 50 Tablet?

You should take Thyronex 50 Tablet as long as your doctor has recommended. Usually, it is prescribed for the long term and you may have to take it lifelong. Do not stop taking the medicine, as your symptoms of low levels of thyroid hormone may reoccur.

How should Thyronex 50 Tablet be taken?

Take Thyronex 50 Tablet exactly as advised by your doctor. Thyronex 50 Tablet should be taken orally preferably before breakfast or as a first meal of the day. It should be swallowed whole with plenty of water.

Being a diabetic what should I be aware of while taking Thyronex 50 Tablet?

Thyronex 50 Tablet may raise blood sugar levels and may affect the working of other anti-diabetic medicines which you might be taking. Hence, dose adjustment may be required. Consult your doctor who will help you with dose management.

Does Thyronex 50 Tablet affect contraception?

Oral birth control pills, which contain both estrogen and progesterone may reduce the amount of Thyronex 50 Tablet in your body and therefore the dose of Thyronex 50 Tablet may have to be increased.

What are the side effects of taking Thyronex 50 Tablet?

The side effects of Thyronex 50 Tablet are mostly seen when it is taken at high doses. These symptoms include allergic reaction, headache, vomiting, flushing, high temperature, sweating, weight loss, tremor, restlessness, and excitability. It may also cause difficulty in sleeping (insomnia), increased pressure around the brain in children (benign intracranial hypertension), chest pain (angina), pounding, irregular or fast heartbeat, diarrhea, muscle cramps, and muscle weakness. The other side effects related to Thyronex 50 Tablet include deformity of the skull in infants caused by the early closure of joints in the skull bone (craniostenosis), growth in children may slow or stop due to changes in bone growth, irregular periods, intolerance to heat, and temporary hair loss in children.

What does thyroxine do? Why is it important?

Thyroxine hormone controls how much energy your body uses. It plays an important role in regulating your body weight, muscle strength, body temperature, and even your mood. Along with that, it is important for your digestion, heart muscles, brain development, and bone health.

Fact Box

Chemical Class

Phenylalanine derivative

Habit Forming

Therapeutic Class

HORMONES

Action Class

Thyroid Hormones

Related lab tests

Anti Thyroglobulin Antibody

Thyroid Function Test

Thyroid Profile Free

Thyroid Stimulating Hormone

References

Brent GA, Koenig RJ. Thyroid and Anti-Thyroid Drugs. In: Brunton LL, Chabner BA, Knollmann BC, editors. Goodman & Gilman’s: The Pharmacological Basis of Therapeutics. 12th ed. New York, New York: McGraw-Hill Medical; 2011. pp. 1142-43.
Dong BJ, Greenspan FS. Thyroid & Antithyroid Drugs. In: Katzung BG, Masters SB, Trevor AJ, editors. Basic and Clinical Pharmacology. 11th ed. New Delhi, India: Tata McGraw Hill Education Private Limited; 2009. pp. 674-75.
Briggs GG, Freeman RK, editors. A Reference Guide to Fetal and Neonatal Risk: Drugs in Pregnancy and Lactation. 10th ed. Philadelphia, PA: Wolters Kluwer Health; 2015. pp. 796-98.
Levothyroxine sodium. East Sussex, UK: Custom Pharmaceuticals Ltd.; 2018. [Accessed 04 Apr. 2019] (online) Available from:
Levothyroxine. Bohemia, New York: Jerome Stevens Pharmaceuticals, Inc. [Accessed 04 Apr. 2019] (online) Available from:
Levothyroxine [Prescribing Information]. Morgantown, WV: Mylan Pharmaceuticals Inc.; 2022. [Accessed 07 Aug. 2023]. (online) Available from:

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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: Zeelab Pharmacy Pvt Ltd
Address: 913, D-104, Pitampura, Delhi-110034

Vendor Details

Country of origin: India
A licensed vendor partner from your nearest location will deliver Thyronex 50 Tablet. Once the pharmacy accepts your order, the details of the pharmacy will be shared with you. Acceptance of your order is based on the validity of your doctor's ℞ and the availability of this medicine.

In case of any issues, contact us

Email ID: [email protected]
Phone Number: 0124-4166666
Address: 5th Floor Tower - B of the Presidency Building, 46/4 Mehrauli Gurgaon Road, Sector 14, Gurugram, Haryana-122001, India

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Provide right medicines

Prescriptions are complex documents. We proof read and recheck at various steps to provide you the right medication in the correct form and dose

In accordance with the law

Most medicines cannot be sold without a valid prescription, as per the Drugs and Cosmetics Act, 1940 and Rules, 1945

Thyronex 50 Tablet

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General Information

Contains

Marketer

Storage

Product introduction

Uses of Thyronex Tablet

Benefits of Thyronex Tablet

Side effects of Thyronex Tablet

How to use Thyronex Tablet

How Thyronex Tablet works

All substitutes for Thyronex 50 Tablet

Thyroactiv 50 Tablet

THYronorm 50mcg Tablet

Eltroxin 50mcg Tablet

Thyrox 50 Tablet

Thyroup 50 Tablet

Quick tips

Safety advice

Alcohol

Pregnancy

Breast feeding

Driving

Kidney

Liver

Interaction with drugs

Allylestrenol (Oral Route)

Amiodarone (Oral Route)

Amiodarone (Injection Route)

Atazanavir (Oral Route)

Calcium (Oral Route)

Frequently asked questions

What should I do if I accidentally take more than the dose required?

How long do I need to take Thyronex 50 Tablet?

How should Thyronex 50 Tablet be taken?

Being a diabetic what should I be aware of while taking Thyronex 50 Tablet?

Does Thyronex 50 Tablet affect contraception?

What are the side effects of taking Thyronex 50 Tablet?

What does thyroxine do? Why is it important?

Fact Box

Chemical Class

Habit Forming

Therapeutic Class

Action Class

Related lab tests

Anti Thyroglobulin Antibody

Thyroid Function Test

Thyroid Profile Free

Thyroid Stimulating Hormone

References

Want to know more

Have issue with the content

Disclaimer

Marketer details

Vendor Details

In case of any issues, contact us

Lab tests offered by us

Related/Popular tests