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Levothyroxine is a synthetic alternative to the hormone that is naturally produced by the thyroid gland to control energy and metabolism. It is typically prescribed when the thyroid does not produce enough of the hormone, which is a condition referred to as hypothyroidism. It may also be used when the thyroid is enlarged or damaged as the result of radiation, surgery, cancer, or a hormone imbalance.

Available Forms

Levothyroxine is available in the form of tablets, capsules, suspensions and powder for use in an injectable solution.

How to Take Levothyroxine

Take levothyroxine at least 30 minutes before any other medications or food. Store the medication away from heat and moisture. A missed dose should be taken when remembered. Skip a missed dose if it is close to time for the next scheduled dose. Do not take additional medication to make up for the missed dose.

Important Considerations

Most patients taking levothyroxine take the medication for the rest of their lives. When first starting levothyroxine, it may take several weeks for the body to respond to levothyroxine. It is normally necessary for patients taking levothyroxine to undergo periodic blood tests to ensure that the dose is therapeutic, and the dosage may need to be adjusted from time to time.

Common Side Effects

Levothyroxine can produce side effects, including mild hair loss, a rapid or irregular heart rate, insomnia, and changes in menstrual periods.


While levothyroxine may help regulate metabolism, it should not be used for weight loss or to treat obesity. It may be contraindicated for individuals with certain thyroid disorders, adrenal gland disorders, or who have had a recent heart attack. Although levothyroxine is normally considered safe while pregnant or nursing, pregnant or nursing women should consult their doctor since the dose may need to be adjusted. We are proud to offer a variety of commercial and compounded medications for the treatment of hypothyroidism and a wide range of other health conditions. Contact us today for more information.

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