Levothyroxine is a thyroid medicine that replaces a hormone normally produced by your thyroid gland to regulate the body’s energy and metabolism. Levothyroxine is given when the thyroid does not produce enough of this hormone on its own.
Levothyroxine treats hypothyroidism (low thyroid hormone). It is also used to treat or prevent goiter (enlarged thyroid gland), which can be caused by hormone imbalances, radiation treatment, surgery, or cancer.
Types of T4 Supplements
There are currently six FDA-approved brands of synthetic T4 supplements available:
Doctors often use weight as a guideline for determining dosage. Some use the formula of 1.6 micrograms of T4 for every 1 kilogram (or 2.2 pounds) of weight for a starting dosage. Others prefer a more conservative approach, starting patients at a very low dose (perhaps as low as 25 micrograms). Note the 1.6 micrograms is a full replacement dose. This means that if part of your thyroid still functions properly, you won’t need this full dose because you will continue to make some of their own T4, in addition to the dose in the pill.
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