Levothyroxine 200mcg
Generic For: Synthroid
Levothyroxine 200mcg (brand name Synthroid) is a synthetic thyroid hormone used to treat hypothyroidism and to help manage certain thyroid conditions requiring TSH suppression. It replaces the hormone your thyroid gland is not producing in sufficient amounts. After a licensed provider reviews your prescription, your medication ships directly from a licensed U.S. pharmacy.
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Levothyroxine (Synthroid) is a thyroid hormone replacement used for hypothyroidism, underactive thyroid, and TSH suppression in certain thyroid conditions.
Levothyroxine 200mcg Quick Facts
| Drug class | Thyroid hormone replacement |
|---|---|
| Treats | Hypothyroidism, TSH suppression, thyroid hormone replacement after thyroid surgery |
| Form | Tablet |
| Typical dosing | Take 1 tablet by mouth daily in the morning. |
| Prescription required | Yes — prescription only |
What Is Levothyroxine 200mcg?
Levothyroxine is a man-made version of thyroxine (T4), the main hormone produced by the thyroid gland. When the thyroid is underactive (hypothyroidism), the body does not make enough of this hormone, which can cause fatigue, weight gain, cold intolerance, and other symptoms. Levothyroxine restores normal hormone levels so the body can function properly. It is taken as a once-daily tablet, and most people take it long term with periodic blood tests to confirm the dose is right.
What Does Levothyroxine 200mcg Treat?
Primary hypothyroidism (underactive thyroid)
Hypothyroidism after thyroid surgery or radioiodine therapy
Secondary (pituitary) hypothyroidism
Tertiary (hypothalamic) hypothyroidism
Congenital hypothyroidism
TSH suppression in well-differentiated thyroid cancer (adjunct)
Levothyroxine 200mcg Dosage
Hypothyroidism (adults): approximately 1.6 mcg/kg by mouth once daily on an empty stomach, 30–60 minutes before breakfast.
Older adults or those with cardiac disease: start 12.5–50 mcg once daily; titrate every 4–6 weeks based on TSH.
Dose is individualized; continue as directed with periodic lab monitoring.
Your prescriber will determine the dose and duration that are right for you. Always follow the directions on your prescription label.
Levothyroxine 200mcg Side Effects
Common side effects
- Hair loss (usually temporary, early in treatment)
- Headache
- Insomnia or trouble sleeping
- Nervousness or irritability
- Increased appetite
- Sweating
- Mild weight changes
- Menstrual cycle changes
Serious side effects
Stop taking this medication and seek medical attention right away if you experience:
- Chest pain or rapid/irregular heartbeat
- Signs of too much thyroid hormone (tremor, heat intolerance, significant weight loss)
- Shortness of breath
- Seizures
- Severe allergic reaction (rash, swelling, difficulty breathing)
Warnings & Interactions
Do not use for weight loss; large doses may cause serious or life-threatening effects (boxed warning)
Contraindicated in untreated adrenal insufficiency
Use caution with heart disease; may worsen angina or arrhythmias
May affect blood sugar control in diabetes; monitor closely
Separate from calcium, iron, antacids, and certain other medications by at least 4 hours
Long-term over-replacement may decrease bone mineral density
Dose adjustments may be needed during pregnancy; tell your provider if pregnant
Tell your prescriber about all medications, supplements, and health conditions before starting levothyroxine 200mcg.
Sources & References
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