Levothyroxine 50mcg
Generic For: Synthroid
Levothyroxine 50mcg (brand name Synthroid) is a synthetic thyroid hormone used to treat hypothyroidism and certain thyroid conditions, including goiter. It replaces the hormone your thyroid gland normally produces, helping restore normal energy levels and metabolism. After a licensed provider reviews your prescription, your medication ships from a licensed U.S. pharmacy.
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90-day supply · $0.28/tablet
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Buy Levothyroxine 50mcg (Synthroid) Online
A thyroid hormone replacement for hypothyroidism, goiter, and thyroid hormone deficiency
Levothyroxine 50mcg Quick Facts
| Drug class | Thyroid hormone replacement |
|---|---|
| Treats | Hypothyroidism, goiter, thyroid cancer (TSH suppression) |
| Form | Tablet |
| Typical dosing | Take 1 tablet by mouth daily in the morning. |
| Prescription required | Yes — prescription only |
What Is Levothyroxine 50mcg?
Levothyroxine is a man-made version of thyroxine (T4), a hormone naturally produced by the thyroid gland. When the thyroid does not make enough hormone, levothyroxine replaces it to support normal metabolism, energy, and body temperature regulation. It is the most commonly prescribed treatment for hypothyroidism in the United States and is taken as a once-daily tablet. Levothyroxine 50mcg is available as the brand Synthroid and as a generic.
What Does Levothyroxine 50mcg Treat?
Primary hypothyroidism
Secondary (pituitary) hypothyroidism
Tertiary (hypothalamic) hypothyroidism
Subclinical hypothyroidism (select patients)
Euthyroid goiter
TSH suppression in well-differentiated thyroid cancer (adjunct)
Levothyroxine 50mcg Dosage
Adults: approximately 1.6 mcg/kg by mouth once daily on an empty stomach, 30-60 minutes before breakfast.
Starting dose is individualized; adjust in 12.5-25 mcg increments every 4-6 weeks based on TSH.
Lower starting doses recommended for elderly patients or those with cardiac disease.
Your prescriber will determine the dose and duration that are right for you. Always follow the directions on your prescription label.
Levothyroxine 50mcg Side Effects
Common side effects
- Hair loss (temporary, during first months)
- Headache
- Insomnia
- Nervousness or irritability
- Increased appetite
- Weight changes
- Sweating
- 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, swelling, difficulty breathing)
- Seizures
- Severe shortness of breath
- Signs of too much thyroid hormone (tremor, heat intolerance, extreme weight loss)
Warnings & Interactions
Not for weight loss; large doses can cause serious or life-threatening effects
Contraindicated in uncorrected adrenal insufficiency
Use caution in patients with cardiovascular disease; may worsen angina or arrhythmias
Separate from calcium, iron, and antacids by at least 4 hours
May alter effects of warfarin, insulin, and diabetes medications
Dose needs often change during pregnancy; tell your provider if pregnant
Long-term overtreatment may decrease bone mineral density
Tell your prescriber about all medications, supplements, and health conditions before starting levothyroxine 50mcg.
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