Levothyroxine is one of the most commonly prescribed medicines for thyroid disorders. If you or someone in your family has been diagnosed with hypothyroidism, chances are a doctor has recommended Levothyroxine.
In this detailed guide, we’ll cover everything you need to know about Levothyroxine — including its uses, dosage, side effects, price in India, FAQs, and brand comparisons.
✅ What is Levothyroxine?
Levothyroxine is a synthetic (man-made) form of thyroxine (T4), a hormone naturally produced by the thyroid gland.
The thyroid gland plays a crucial role in controlling:
- Metabolism
- Energy levels
- Body temperature
- Heart rate
- Weight balance
When your thyroid does not produce enough hormone (a condition called hypothyroidism), Levothyroxine helps restore normal hormone levels.
✅ Uses of Levothyroxine
Levothyroxine is mainly prescribed for:
1️⃣ Hypothyroidism
This is the most common use. Symptoms of hypothyroidism include:
- Fatigue
- Weight gain
- Cold intolerance
- Hair loss
- Dry skin
- Depression
- Slow heart rate
Levothyroxine replaces the missing thyroid hormone and improves these symptoms.
2️⃣ Goiter
It helps reduce thyroid gland enlargement (goiter) caused by hormone imbalance.
3️⃣ After Thyroid Surgery
Patients who have had:
- Thyroid removal surgery
- Thyroid cancer treatment
Often require lifelong Levothyroxine therapy.
4️⃣ Thyroid Cancer (Support Treatment)
It may be used to prevent cancer recurrence by suppressing TSH (Thyroid Stimulating Hormone).
✅ How Levothyroxine Works
Levothyroxine works by:
- Replacing the deficient thyroid hormone (T4)
- Converting into active T3 hormone in the body
- Restoring normal metabolism
- Balancing body functions
It does not cure thyroid disease but controls it effectively when taken regularly.
✅ Dosage of Levothyroxine
The dosage depends on:
- Age
- Weight
- Severity of thyroid deficiency
- TSH blood test results
- Other health conditions
💊 Common Dosage Strengths
- 25 mcg
- 50 mcg
- 75 mcg
- 100 mcg
- 125 mcg
- 150 mcg
Doctors usually start with a low dose and adjust after 6–8 weeks based on TSH levels.
📌 How to Take Levothyroxine Properly
For best results:
✔ Take it on an empty stomach
✔ Take it early morning (30–60 minutes before breakfast)
✔ Take it at the same time daily
✔ Avoid taking it with iron, calcium, or milk
Consistency is extremely important.
✅ Side Effects of Levothyroxine
Levothyroxine is generally safe when taken in the correct dose. However, side effects may occur if the dose is too high.
🔹 Common Side Effects (Overdose Symptoms)
- Palpitations
- Increased heart rate
- Anxiety
- Sweating
- Tremors
- Weight loss
- Insomnia
🔹 Rare Side Effects
- Chest pain
- Irregular heartbeat
- Severe headache
If you experience these symptoms, consult your doctor immediately. Blood tests may be required to adjust the dosage.
✅ Who Should Use Levothyroxine Carefully?
Inform your doctor if you have:
- Heart disease
- High blood pressure
- Diabetes
- Osteoporosis
- Adrenal gland disorders
Pregnant women can safely take Levothyroxine but may require dose adjustment.
✅ Price of Levothyroxine in India
The price varies depending on brand and strength.
💰 Approximate Price Range:
- ₹50 – ₹200 per strip (10 tablets)
Generic versions are usually affordable. Prices may vary depending on the pharmacy and location.
✅ Popular Brands of Levothyroxine in India
Here are some commonly available brands:
| Brand Name | Manufacturer |
|---|---|
| Thyronorm | Abbott |
| Eltroxin | GlaxoSmithKline |
| Thyrox | Macleods |
| Levoxyl | Various manufacturers |
| Tirosint | Premium capsule form |
All brands contain Levothyroxine sodium, but absorption may vary slightly.
✅ Levothyroxine vs Other Thyroid Medicines
| Medicine | Used For | Notes |
|---|---|---|
| Levothyroxine (T4) | Hypothyroidism | Most commonly prescribed |
| Liothyronine (T3) | Severe thyroid cases | Faster acting |
| Desiccated Thyroid | Natural thyroid extract | Less commonly used |
👉 Levothyroxine remains the gold standard treatment for hypothyroidism worldwide.
✅ Frequently Asked Questions (FAQs)
❓ 1. Is Levothyroxine a lifelong medicine?
In most cases, yes. Hypothyroidism usually requires lifelong treatment.
❓ 2. How long does Levothyroxine take to work?
You may start feeling better within 2–3 weeks, but full effects take 6–8 weeks.
❓ 3. Can I stop Levothyroxine if I feel better?
No. Stopping suddenly can worsen thyroid levels. Always consult your doctor.
❓ 4. Can Levothyroxine cause weight loss?
Only if the dose is too high. It is not a weight-loss medicine.
❓ 5. What happens if I miss a dose?
Take it as soon as you remember. If it’s close to the next dose, skip the missed one. Do not double dose.
❓ 6. Can I take Levothyroxine at night?
It is usually recommended in the morning, but some studies show nighttime use may also work if taken on an empty stomach consistently.
✅ Important Tips for Thyroid Patients
✔ Get TSH levels tested every 6–12 months
✔ Maintain a healthy diet
✔ Avoid soy and high-fiber meals close to dosing
✔ Stay consistent with the same brand if possible
✔ Inform your doctor about all medicines you take
✅ Conclusion
Levothyroxine is a safe and highly effective treatment for hypothyroidism and other thyroid disorders. When taken correctly and monitored regularly, it helps maintain normal metabolism, energy levels, and overall health.
If you have thyroid symptoms or abnormal TSH levels, consult a healthcare professional for proper diagnosis and treatment.
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