Summary Table

Feature	Description
Dose Strength	100 micrograms (mcg)
Use	Hypothyroidism, goiter, thyroid cancer
Dosage	Once daily, on an empty stomach
Safe in Pregnancy	✅ Yes (may need dose adjustment)
Side Effects	Few if correct dose; high dose = hyperthyroid symptoms
Interactions	Iron, calcium, antacids, warfarin, insulin
Prescription Needed	Yes

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Product Name: Levothyroxine Sodium 100 mcg Tablet

Type: Thyroid hormone replacement
Prescription Status: Prescription required

Levothyroxine sodium – a synthetic form of thyroxine (T4), a hormone normally produced by the thyroid gland.

Hypothyroidism (underactive thyroid)
- Restores normal thyroid hormone levels
- Relieves symptoms like fatigue, weight gain, constipation, cold intolerance, and depression
Goiter prevention (enlarged thyroid)
Thyroid cancer management (as part of hormone suppression therapy)
Post-thyroidectomy hormone replacement

Typical adult dose: 100 mcg once daily (adjusted based on thyroid function tests and clinical response)
Take on an empty stomach, at least 30–60 minutes before breakfast, with water
Do not take with calcium, iron, or antacids—they reduce absorption
Note: Dose may differ based on age, weight, severity of hypothyroidism, and other conditions (e.g., cardiac disease, pregnancy).

Monitor TSH and T4 levels regularly
Adjust dose slowly in elderly or cardiac patients to prevent angina or arrhythmias
Not for weight loss – unsafe at high doses
Inform your doctor if you’re pregnant, breastfeeding, or on other medications

Avoid taking Levothyroxine with or near:

Iron supplements, calcium carbonate, aluminum antacids, cholestyramine – reduce absorption
Warfarin – effects may be enhanced (monitor INR)
Diabetes medications – thyroid correction may affect blood sugar control
Estrogens – may increase thyroxine requirements