Levothyroxine 150mcg
Generic For: Synthroid
Levothyroxine 150mcg (brand name Synthroid) is a synthetic thyroid hormone used to treat hypothyroidism — an underactive thyroid gland. It replaces the hormone your thyroid would normally produce, helping restore normal energy, metabolism, and body function. After a licensed provider reviews your prescription, your order ships from a licensed U.S. pharmacy.
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Levothyroxine is a thyroid hormone replacement used for hypothyroidism, low thyroid hormone levels, and certain thyroid conditions
Levothyroxine 150mcg Quick Facts
| Drug class | Thyroid hormone replacement |
|---|---|
| Treats | Hypothyroidism, thyroid hormone deficiency, TSH suppression in thyroid cancer |
| Form | Tablet |
| Typical dosing | Take 1 tablet by mouth daily in the morning. |
| Prescription required | Yes — prescription only |
What Is Levothyroxine 150mcg?
Levothyroxine is a man-made version of thyroxine (T4), the main hormone produced by the thyroid gland. It is prescribed when the thyroid does not make enough hormone on its own, a condition called hypothyroidism. Taken once daily, levothyroxine helps normalize metabolism, energy levels, and other body processes controlled by thyroid hormone. The 150mcg tablet is one of several strengths; your provider selects and adjusts your dose based on lab tests.
What Does Levothyroxine 150mcg Treat?
Hypothyroidism (underactive thyroid)
Primary hypothyroidism from thyroid gland failure
Hypothyroidism after thyroid surgery or radioiodine therapy
Secondary (pituitary) hypothyroidism
Tertiary (hypothalamic) hypothyroidism
TSH suppression in well-differentiated thyroid cancer (adjunct)
Levothyroxine 150mcg Dosage
Adults with hypothyroidism: approximately 1.6 mcg/kg by mouth once daily on an empty stomach, 30–60 minutes before breakfast.
Dose individualized and adjusted every 4–6 weeks based on TSH levels.
Older adults or those with cardiac disease: start lower (e.g., 12.5–25 mcg daily) and titrate slowly.
Your prescriber will determine the dose and duration that are right for you. Always follow the directions on your prescription label.
Levothyroxine 150mcg Side Effects
Common side effects
- Headache
- Insomnia or trouble sleeping
- Nervousness or irritability
- Increased sweating
- Diarrhea
- Changes in appetite
- Weight changes
- Menstrual irregularities
Serious side effects
Stop taking this medication and seek medical attention right away if you experience:
- Chest pain or rapid, irregular heartbeat
- Signs of allergic reaction (rash, hives, swelling, trouble breathing)
- Severe headache with vision changes
- Seizures
- Tremor with fever and confusion (signs of too much thyroid hormone)
Warnings & Interactions
Not for weight loss; large doses can cause serious or life-threatening effects (boxed warning)
Do not use in untreated adrenal insufficiency
Use caution with heart disease; can worsen angina or arrhythmias
May affect blood sugar control in diabetes and increase effects of blood thinners like warfarin
Take 4 hours apart from calcium, iron, antacids, and some cholesterol medicines
Long-term overtreatment may reduce bone density, especially in postmenopausal women
Dose needs often change during pregnancy — tell your provider promptly
Tell your prescriber about all medications, supplements, and health conditions before starting levothyroxine 150mcg.
Sources & References
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