THYROACTIV 12.5 Tablet 100's

Introduction About THYROACTIV 12.5 TABLET

THYROACTIV 12.5 TABLET contains thyroxine, a synthetic thyroid hormone that helps restore normal thyroid function in the body. It is primarily prescribed for patients with hypothyroidism, a condition where the thyroid gland does not produce enough hormone. This results in symptoms such as fatigue, sluggishness, weight gain, cold intolerance, and mental slowing. THYROACTIV 12.5 TABLET is also used to support healthy metabolism, energy balance, and normal organ function in patients with low thyroid hormone levels. Its consistent use helps improve overall quality of life and supports normal growth, heart function, and mental alertness. 

This medicine is ideal for patients with diagnosed hypothyroidism, including those with congenital thyroid hormone deficiency, thyroid surgery, or certain cases of goitre. THYROACTIV 12.5 TABLET may also be prescribed for patients needing thyroid hormone replacement during pregnancy under strict medical supervision. It is taken once daily on an empty stomach, preferably in the morning, at least 30–60 minutes before breakfast. Swallow the tablet whole with water and maintain consistent timing every day. Foods, supplements, or medications containing calcium, iron, or high fibre should be taken several hours apart to avoid reducing absorption.

Patients should inform their doctor about any heart disease, diabetes, adrenal or pituitary disorders, as these conditions may require dose adjustments or closer monitoring. THYROACTIV 12.5 TABLETshould not be used for weight loss in individuals with normal thyroid function. Sudden discontinuation or self-adjustment of dose can lead to thyroid imbalance. Regular thyroid function tests are recommended to ensure the correct dose. Overdose may lead to symptoms of hyperthyroidism such as rapid heartbeat, anxiety, sweating, headache, or in severe cases, heart complications and seizures.

THYROACTIV 12.5 TABLET is generally considered safe during pregnancy and breastfeeding when prescribed and monitored by a doctor, as maintaining normal thyroid levels is essential for maternal and foetal health. Common side effects are rare but may include mild headache, palpitations, nervousness, or sweating, usually related to dose adjustments. Overall, THYROACTIV 12.5 TABLET provides reliable thyroid hormone replacement, supporting metabolism, energy, and overall well-being under proper medical guidance.

Uses Of THYROACTIV 12.5 TABLET

• Used to manage hypothyroidism

Benefits of THYROACTIV 12.5 TABLET

THYROACTIV 12.5 TABLET for Hypothyroidism

THYROACTIV 12.5 TABLET contains thyroxine, a synthetic thyroid hormone that helps replace the hormone your thyroid gland may not produce enough of. It is commonly prescribed for hypothyroidism, a condition where the body’s metabolism slows due to low thyroid hormone levels. Regular use helps restore hormone balance, reduce symptoms like fatigue, weight gain, and cold intolerance, and supports normal heart, brain, and digestive functions. Consistent intake under medical supervision is essential for effective management. 

THYROACTIV 12.5 TABLET for Healthy Metabolism and Energy Balance

THYROACTIV 12.5 TABLET helps maintain a healthy metabolic rate by ensuring adequate thyroid hormone in the body. This supports efficient energy production, digestion, and calorie utilization, helping you stay active and alert. Proper thyroid hormone levels also help maintain steady body weight, mental clarity, and overall vitality. Taking the medicine consistently as advised by your doctor ensures optimal metabolism and energy balance.

How THYROACTIV 12.5 TABLET Works

THYROACTIV 12.5 TABLET contains thyroxine, a synthetic form of the thyroid hormone thyroxine (T4). After oral intake, it is absorbed into the bloodstream and converted in the body to its active form, triiodothyronine (T3). This active hormone enters body cells and helps regulate essential functions such as metabolism, energy production, body temperature, and heart activity. By supplementing the hormone that the thyroid gland does not produce in adequate amounts, THYROACTIV 12.5 TABLET helps restore and maintain normal thyroid hormone balance when taken regularly as prescribed.

How to use THYROACTIV 12.5 TABLET

How to Take THYROACTIV 12.5 TABLET

• Take THYROACTIV 12.5 TABLET exactly as prescribed by your doctor.
• It is usually taken once daily on an empty stomach.
• Take the tablet in the morning, at least 30–60 minutes before breakfast.
• Swallow the tablet whole with a glass of water.
• Do not crush or chew the tablet unless advised by your doctor.
• Take it at the same time every day to maintain consistent hormone levels.
• Avoid taking it along with calcium, iron supplements, or antacids; keep a gap of at least 4 hours.
• Do not stop or change the dose on your own without medical advice.

What if I forgot to take THYROACTIV 12.5 TABLET

• If you miss a dose, take it as soon as you remember on the same day.
• If it is close to the time for your next scheduled dose, skip the missed dose and continue with your regular dosing schedule.
• Do not take two doses at the same time to compensate for a missed tablet.
• Missing a single dose occasionally is unlikely to cause problems, but regular dosing helps maintain stable thyroid hormone levels.
• If you miss doses frequently or forget the medicine for several days, consult your doctor for advice on how to restart safely.
• To reduce the chances of missing a dose, take THYROACTIV 12.5 TABLET at the same time every day, preferably in the morning on an empty stomach.

Overdose

If you or someone else has accidentally taken more than the prescribed dose of THYROACTIV 12.5 TABLET, seek medical help immediately or visit the nearest hospital. An overdose may lead to high thyroid hormone levels. Possible symptoms include restlessness, confusion, irritability, headache, excessive sweating, dilated pupils, fast or irregular heartbeat, rapid breathing, fever, frequent bowel movements, and seizures. Mental symptoms such as anxiety, nervousness, fatigue, or mood changes may also occur. In severe cases, overdose can cause a thyroid crisis, leading to serious heart problems, seizures, coma, or heart failure.

Side Effects Of THYROACTIV 12.5 TABLET

Common side effects of THYROACTIV 12.5 TABLET

• Increased appetite
• Weight variations
• Headache
• Vomiting, diarrhoea
• Changes in the menstrual cycle
• Fever
• Sensitivity to heat
• Cramps and mood swings

When to Seek Medical Attention?

Stop taking THYROACTIV 12.5 TABLET and contact your doctor immediately if you experience any of the following side effects:

• Severe nervousness, anxiety, tremors, or sweating.
• Unexplained weight loss, increased appetite, or heat intolerance.
• Shortness of breath or extreme tiredness.

How To Manage Side Effects

Warning & Precautions

Other Warnings for THYROACTIV 12.5 TABLET

Before taking THYROACTIV 12.5 TABLET, inform your doctor if you:

• Have severe or chronic hypothyroidism
• Have a history of thyroid cancer
• Have diabetes mellitus or insipidus
• Have pituitary and/or adrenocortical insufficiency
• Have thyroid autonomy
• Have secondary hypothyroidism or panhypopituitarism
• Have a history of fits
• Have myxoedema
• Have malabsorption syndrome

Who should not take THYROACTIV 12.5 TABLET

THYROACTIV 12.5 TABLET is not recommended for use if you:

• Have unmanaged hyperthyroidism
• Have unmanaged subclinical or overt thyrotoxicosis
• Have unmanaged adrenal insufficiency
• Have unmanaged pituitary insufficiency

Safety Advice

• Take THYROACTIV 12.5 TABLET only as prescribed by your doctor and at the recommended dose.
• Do not stop, skip, or change the dose without medical advice.
• Take it on an empty stomach, preferably in the morning, for proper absorption.
• Inform your doctor if you have heart problems, diabetes, or adrenal disorders.
• Regular thyroid function tests are important to ensure the dose remains appropriate.
• Keep a time gap when taking calcium, iron supplements, or antacids.

Diet and Lifestyle Advice

• Take THYROACTIV 12.5 TABLET on an empty stomach, at least 30–60 minutes before breakfast.
• Avoid taking it along with milk, soy products, high-fibre foods, calcium, or iron supplements; keep a gap of at least 4 hours.
• Follow a balanced diet that includes fruits, vegetables, whole grains, and lean proteins.
• Limit excessive intake of processed foods and refined sugars.
• Stay well hydrated throughout the day.
• Maintain a regular daily routine for taking the tablet at the same time each day.
• Get adequate sleep to support energy levels and hormone balance.
• Engage in moderate physical activity such as walking or yoga, as advised by your doctor.
• Manage stress through relaxation techniques like meditation or deep breathing.
• Attend regular follow-up appointments and blood tests to monitor thyroid levels.

Drug - Drug interaction

1. Calcium supplements (e.g., calcium carbonate)

• Interaction: Calcium can reduce the absorption of thyroxine from the gut.
• Management: Take calcium supplements at least 4 hours after THYROACTIV 12.5 TABLET.

2. Iron supplements (e.g., ferrous sulfate)

• Interaction: Iron binds to thyroxine and lowers its absorption.
• Management: Maintain a minimum 4-hour gap between the two.

3. Antacids and acid reducers (aluminium hydroxide, magnesium, sucralfate)

• Interaction: These medicines can interfere with thyroxine absorption.
• Management: Take THYROACTIV 12.5 TABLET 4 hours before or after such products.

4. Cholesterol-lowering resins (cholestyramine, colestipol)

• Interaction: These can bind thyroxine in the intestine and reduce its effect.
• Management: Separate dosing by 4–6 hours and monitor thyroid levels if needed.

5. Diabetes medicines (insulin, oral antidiabetics)

• Interaction: thyroxine may alter blood sugar control.
• Management: Blood glucose may need closer monitoring; dose adjustments may be advised by the doctor.

6. Heart medicines (beta-blockers, digoxin)

• Interaction: Thyroid hormone levels can influence heart rate and drug response.
• Management: Regular monitoring; dose changes may be required under medical supervision.

7. Blood thinners (warfarin)

• Interaction: thyroxine may increase the effect of anticoagulants.
• Management: Monitor clotting parameters (e.g., INR) and adjust doses if advised.

8. Antiepileptic medicines (phenytoin, carbamazepine)

• Interaction: These may reduce thyroxine levels by increasing metabolism.
• Management: Thyroid function tests may be needed; dose adjustment may be considered.

9. Antidepressants (tricyclics, SSRIs)

• Interaction: May enhance effects on the heart or alter thyroid hormone response.
• Management: Use with caution and monitor symptoms and labs as advised.

10. Estrogen-containing medicines (oral contraceptives, hormone therapy)

• Interaction: Estrogens can increase the need for thyroxine.
• Management: Thyroid tests may guide dose adjustments.

Drug - Food interaction

1. Milk and dairy products

Interaction: Calcium in milk, cheese, and yogurt can bind thyroxine and reduce its absorption.
Management: Take THYROACTIV 12.5 TABLET 30–60 minutes before consuming dairy products.

2. Soy products (soy milk, tofu, soybeans)

Interaction: Soy can interfere with thyroxine absorption.
Management: Maintain a gap of at least 4 hours between THYROACTIV 12.5 TABLET and soy products.

3. High-fibre foods (bran, cereals, whole grains)

Interaction: Excessive fibre may slow the absorption of thyroid hormone.
Management: Consume high-fibre foods later in the day, not immediately with the tablet.

4. Coffee and caffeinated drinks

Interaction: Coffee can decrease the absorption of thyroxine if taken together.
Management: Wait 30–60 minutes after taking THYROACTIV 12.5 TABLET before drinking coffee or tea.

5. Grapefruit and grapefruit juice

Interaction: May interfere with the metabolism of some medications, potentially affecting thyroid hormone levels.
Management: Avoid consuming grapefruit around the time of taking the tablet.

6. Iron-rich foods (spinach, lentils, fortified cereals)

Interaction: Iron can bind to thyroxine and reduce absorption.
Management: Take iron-containing foods or supplements at least 4 hours apart from THYROACTIV 12.5 TABLET.

Synopsis

Drug	Thyroxine
Pharmacological Category	Thyroid Hormones
Therapeutic Indication	Hypothyroidism
Dosage Forms	Tablet

 

More Information

FAQs About THYROACTIV 12.5 TABLET

Q: What is THYROACTIV 12.5 TABLET used for?

A: THYROACTIV 12.5 TABLET contains thyroxine, a synthetic form of thyroid hormone. It helps maintain normal thyroid hormone levels in the body. Doctors usually prescribe it when the thyroid gland does not produce enough hormone. It supports normal metabolism, energy levels, and overall body functions.

Q: How should I take THYROACTIV 12.5 TABLET?

A: Take THYROACTIV 12.5 TABLET exactly as prescribed by your doctor. It is usually taken once daily on an empty stomach. Swallow it with water, preferably in the morning. Avoid eating for at least 30-60 minutes after taking it.

Q: Can I take THYROACTIV 12.5 TABLET with food?

A: It is best taken on an empty stomach for better absorption. Food, especially high-fibre or calcium-rich foods, may reduce its absorption. Try to maintain a consistent routine every day. Follow your doctor’s advice regarding meal timing.

Q: How long do I need to take THYROACTIV 12.5 TABLET?

A: The duration depends on your thyroid condition and doctor’s advice. Many people need it for a long time or even lifelong. Your dose may change based on blood test results. Do not stop taking it without consulting your doctor.

Q: What are the common side effects of THYROACTIV 12.5 TABLET?

A: Some people may experience headache, nervousness, or sweating. Palpitations or mild weight changes may also occur. These effects are often related to dose adjustments. Inform your doctor if symptoms persist or worsen.

Q: Does THYROACTIV 12.5 TABLET cause weight changes?

A: THYROACTIV 12.5 TABLET helps regulate metabolism by balancing thyroid hormones. Weight changes may occur initially as hormone levels stabilize. It does not directly cause weight gain or loss. Healthy diet and lifestyle remain important.

Q: Can THYROACTIV 12.5 TABLET affect sleep?

A: Some people may notice difficulty sleeping, especially at higher doses. Taking it early in the morning may help avoid sleep issues. Sleep problems usually improve once the dose is adjusted. Discuss persistent sleep disturbances with your doctor.

Q: Can I stop THYROACTIV 12.5 TABLET suddenly?

A: Do not stop taking THYROACTIV 12.5 TABLET without medical advice. Sudden discontinuation may disturb hormone balance. Your doctor may gradually adjust or stop the dose if needed. Regular blood tests guide such decisions.

Q: Does THYROACTIV 12.5 TABLET interact with other medicines?

A: Yes, certain medicines may affect its absorption or action. Calcium, iron supplements, and antacids should be taken separately. Always inform your doctor about all medicines you use. Maintain a time gap if advised.

Q: Can I take vitamins with THYROACTIV 12.5 TABLET?

A: Some vitamins, especially those containing iron or calcium, may interfere with absorption. Take them at least 4 hours apart from THYROACTIV 12.5 TABLET. Check supplement labels carefully. Consult your doctor for proper timing.

Q: Is THYROACTIV 12.5 TABLET habit-forming?

A: No, THYROACTIV 12.5 TABLET is not habit-forming. It is a hormone replacement used to support normal body functions. Long-term use does not cause dependency. Stopping or changing the dose should still be medically guided.

Q: Can THYROACTIV 12.5 TABLET be taken at night?

A: Morning intake is usually preferred for best absorption. Night-time intake may affect sleep in some people. If advised otherwise, keep the timing consistent. Follow your doctor’s specific instructions.

Q: Does THYROACTIV 12.5 TABLET need regular blood tests?

A: Yes, periodic thyroid function tests are important. They help check if the dose is correct. Tests are usually done every few months initially. Your doctor may adjust the dose based on results.

Q: What should I tell my doctor before taking THYROACTIV 12.5 TABLET?

A: Inform your doctor about heart conditions, diabetes, or adrenal problems. Mention all medicines and supplements you are taking. Share any history of thyroid surgery or disorders. This helps determine the right dose.

Q: Can THYROACTIV 12.5 TABLET affect heart rate?

A: If the dose is higher than required, it may increase heart rate. Palpitations or chest discomfort should be reported promptly. Proper dose adjustment reduces such risks. Regular monitoring is important.

Q: Is THYROACTIV 12.5 TABLET safe for long-term use?

A: Yes, it is commonly used long-term when prescribed correctly. Regular monitoring ensures safety and effectiveness. Dose changes may be needed over time. Always stick to medical advice.

Q: When should I contact my doctor while taking THYROACTIV 12.5 TABLET?

A: Contact your doctor if you notice unusual symptoms like chest pain or severe palpitations. Persistent fatigue, weight changes, or mood changes should also be reported. Regular follow-ups help maintain proper hormone balance. Never adjust the dose on your own.

References

1. KD. Tripathi. Thyroid hormones and thyroid inhibitors. Essentials of medical pharmacology. Eight edition. 2019. Page-273.

2. Mateo RCI, Hennessey JV. Thyroxine and treatment of hypothyroidism: seven decades of experience. Endocrine. 2019. [Accessed on 23rd October 2026]

3. GlaxoSmithKline Pharmaceuticals Limited. Thyroxine. [Revised in June 2023] [Accessed on 23rd October 2026]

4. Thyroxine sodium. Leeford Healthcare Ltd. [Accessed on 23rd October 2026]

5. Drug bank. Levothyroxine. [Accessed on 23rd October 2026]

Useful Diagnostic Tests

• Thyroid Stimulating Hormone (TSH)
• Basic Thyroid Care
• Advance Thyroid Care
• Comprehensive Thyroid Care
• Thyroid Profile-Total (T3,T4&Tsh)
• Thyroid Profile-Free (Ft3, Ft4 & TSH)
• Netmeds Thyroid Package
• Thyroid Panel-2
• Healthians Thyroid Test
• Thyroid Package-Advance
• Thyroid Package-Preventive
• Jaanch Thyroid Profile Advanced

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