The thyroid medication levothyroxine ... The amount of levothyroxine in a tablet can differ between manufacturers. For example, a 100 mcg tablet may contain between 95 mcg and 105 mcg of hormone.

It comes in 12 different tablet doses ranging from 25 mcg to 300 mcg. Your healthcare provider will help monitor thyroid hormone levels in your blood to determine the best levothyroxine dose for ...

FDA is penalizing companies that filed late for approval of levothyroxine ... that all strengths of Synthroid -- including the most frequently prescribed dose of 100 mcg -- will remain available ...