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Levothyroxine is a prescription medication used to treat an underactive thyroid. Levothyroxine is a synthetic thyroid hormone, which replaces the body's reduced levels of this natural thyroid hormone.
This medication comes in tablet form and is taken once in the morning on an empty stomach with a glass of water.
Common side effects of levothyroxine include tremors, a change in appetite, and irregular heartbeats.
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