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Is Levothyroxine the Same as Synthroid?

Is Levothyroxine the Same as Synthroid?

Levothyroxine and Synthroid are two commonly prescribed medications for hypothyroidism. While they are similar in many ways, there are some key differences between the two.

What is Levothyroxine?

Levothyroxine is a synthetic form of the thyroid hormone thyroxine. It is the generic name for the medication and is available under various brand names, including Synthroid. Levothyroxine is used to treat an underactive thyroid (hypothyroidism) by replacing the hormone that your thyroid is unable to produce enough of on its own.

What is Synthroid?

Synthroid is a brand-name version of levothyroxine. The active ingredient in Synthroid is still levothyroxine sodium, but it may contain different Buy Synthroid inactive ingredients than generic versions of the medication. These inactive ingredients can affect how the medication is absorbed by your body.

Are They the Same?

In short, yes – levothyroxine and Synthroid are essentially the same medication. Both are used to treat hypothyroidism and contain the same active ingredient. However, some patients may notice a difference when switching between the two due to variations in the inactive ingredients.


Whether you are prescribed levothyroxine or Synthroid, it is important to take your medication exactly as directed by your healthcare provider. If you have concerns about your medication or experience any unusual side effects, be sure to discuss them with your doctor. Remember, managing your hypothyroidism effectively can help you feel your best and lead a healthy life.