Levothyroxine (Synthroid®) Side Effects for Hypothyroidism

As the most prescribed drug in the United States, levothyroxine for hypothyroidism doesn't come without side effects.

What Exactly is Levothyroxine?

Levothyroxine is a prescription medication used to treat underactive thyroid or hypothyroidism. It is available under the brand names Synthroid®, Unithroid®, Levothroid®, Levoxyl®, Levo-T®, and Tirosint®. These synthetic medications will replace or provide your body with thyroid hormone that is not being produced naturally.

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