Levothyroxine

Introduction

**Levothyroxine** is a synthetic form of the thyroid hormone thyroxine (T4), used primarily to treat **hypothyroidism**, a condition where the thyroid gland does not produce enough hormones. It helps restore normal energy levels, metabolism, and body functions. Levothyroxine is also used to treat or prevent goiter (enlarged thyroid gland) and is sometimes prescribed after thyroid surgery or radiation. It is a lifelong medication for many individuals and requires regular monitoring to ensure the correct dose is maintained.

Uses of Levothyroxine

• Treatment of hypothyroidism (underactive thyroid)
• Prevention and treatment of goiter
• Post-thyroidectomy hormone replacement
• Supportive therapy in thyroid cancer treatment
• Used in thyroid-stimulating hormone (TSH) suppression therapy

How Levothyroxine Works

Levothyroxine works by replacing or supplementing the natural thyroid hormone (T4) that the thyroid gland is unable to produce in sufficient quantity. It regulates metabolism, energy levels, body temperature, and heart rate, helping maintain overall bodily functions.

Benefits of Levothyroxine

• Restores normal thyroid hormone levels
• Improves energy, mood, and concentration
• Helps manage weight by restoring metabolic rate
• Reduces symptoms like fatigue, hair thinning, and cold sensitivity
• Supports long-term thyroid health and stability

How to Take Levothyroxine

Levothyroxine should be taken on an empty stomach, usually in the morning, at least 30 to 60 minutes before breakfast. Take it with a full glass of water. Avoid taking calcium, iron, or antacid supplements within 4 hours of the dose. Follow your doctor’s dosing instructions carefully and do not stop the medication without consulting your physician.

Type of Dosage Available

• Oral tablets (available in various strengths)
• Oral liquid solution (for pediatric or specific patient needs)
• Injectable form (rarely used in hospital settings)

Side Effects of Levothyroxine

• Increased heart rate or palpitations
• Insomnia or restlessness
• Weight loss
• Heat intolerance or sweating
• Hair thinning (especially during early treatment)
• Chest pain or shortness of breath (serious and rare)
• Allergic reactions (very rare)

Safety Advice

• Regular blood tests (TSH, T3, T4) are needed to adjust dose
• Inform your doctor of any heart conditions before use
• Do not use for weight loss in people with normal thyroid function
• Safe for use in pregnancy but requires monitoring
• Avoid switching brands without medical advice
• Keep the medication in a dry, cool place away from sunlight

Frequently Asked Questions (FAQs)

Q: What is Levothyroxine used for?

A: It is used to treat hypothyroidism, prevent goiter, and support hormone replacement after thyroid surgery or radiation.

Q: When should I take Levothyroxine?

A: Take it once daily on an empty stomach, ideally 30–60 minutes before breakfast for best absorption.

Q: Can I stop taking Levothyroxine if I feel better?

A: No, it is a lifelong therapy for many patients. Stopping it can cause symptoms to return or worsen.

Q: How long does it take to see results?

A: You may start noticing improvements within 2 to 3 weeks, but full effects can take up to 6 weeks.

Q: Can I take Levothyroxine with other medications?

A: Yes, but keep a gap of at least 4 hours from calcium, iron, or antacids. Always inform your doctor about all medications you're taking.