Endocrine System Home > Levothyroxine

Levothyroxine is a prescription drug licensed for the treatment of hypothyroidism and other thyroid problems. It works by increasing certain thyroid hormones in the body. Although most people tolerate levothyroxine well, side effects can include things such as hair loss, insomnia, and heart palpitations. The drug comes in tablet form and is taken once a day, typically in the morning.

What Is Levothyroxine?

Levothyroxine sodium is a prescription thyroid medication. It is actually a synthetic version of a naturally occurring thyroid hormone. Levothyroxine is approved to treat an underactive thyroid (known medically as hypothyroidism). It is also approved for the treatment of a variety of other thyroid problems, including certain types of thyroid cancer.
 
(Click What Is Levothyroxine Used For? for more information, including possible off-label uses.)
 

Side Effects of Levothyroxine

As with any medicine, side effects are possible with levothyroxine. However, not everyone who takes the drug will experience side effects. In fact, most people tolerate it quite well. Serious side effects are less common.
 
Some of the possible side effects include but are not limited to:
 
(Click Levothyroxine Side Effects to learn more, including potentially serious side effects you should report immediately to your healthcare provider.)
 
Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
Last updated/reviewed:
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