Synthroid dosage depends entirely on your individual needs, determined by your doctor through blood tests. Your doctor will prescribe a specific amount of levothyroxine, the active ingredient in Synthroid, measured in micrograms (mcg). Common starting doses range from 25mcg to 100mcg daily, depending on factors such as your age, weight, and the severity of your hypothyroidism.
Adjusting Your Synthroid Dosage
Regular blood tests are vital to monitor your thyroid hormone levels (TSH and free T4). Based on these results, your doctor may adjust your dosage. Increasing or decreasing the dosage usually happens in small increments to prevent significant side effects. Never change your dosage without consulting your physician.
Taking Synthroid Correctly
Take Synthroid on an empty stomach, at least 30 minutes before breakfast, with a full glass of water. Consistency is key. Avoid taking it with calcium supplements, antacids, or iron supplements, as these can interfere with absorption. Specific timing and method may be provided by your prescribing doctor. If you miss a dose, take it as soon as you remember, unless it’s almost time for your next dose. Never double up on doses. Report any changes in your health to your physician immediately.
Potential Side Effects
Common side effects may include headaches, weight changes, increased heart rate, and insomnia. If you experience severe or persistent side effects, contact your doctor immediately. The right dosage minimizes these, but individual responses vary.
Long-Term Treatment
Synthroid is typically a lifelong medication for hypothyroidism. Maintaining regular checkups and adhering strictly to your prescribed dosage ensure optimal thyroid function and overall well-being.


