Synthroid and levothyroxine are narrow therapeutic index drugs, which means that changing from brand to generic, or vice versa, can cause significant changes in blood levels.

Levothyroxine (Synthroid) is an oral medication used to treat hypothyroidism (underactive thyroid). It's a lab-made version of the T4 thyroid hormone. It's important to stick to the same ...

Boston)—While severe maternal hypothyroidism (low thyroid hormone levels) in pregnancy is known to increase risks of adverse pregnancy outcomes, it ...

Medically reviewed by Ana Maria Kausel, MD The thyroid medication levothyroxine should be taken on an empty stomach at around ...

Synthroid (levothyroxine) is a brand-name oral tablet that’s prescribed for hypothyroidism and a certain type of thyroid cancer in adults and children. As with other drugs, Synthroid can cause ...

Levothyroxine — marketed under brand names such as Synthroid — is the second-most commonly prescribed medication among older adults in the US. A new study has found that it may be associated ...

Levothyroxine and Liothyronine are synthetic hormones contained in the thyroid tablets. The voluntary national recall alert says there have been no "adverse events" associated with the recalled ...

A widely prescribed thyroid medication called levothyroxine may cause bone loss and increase the risk of the bone disease osteoporosis, according to new research—but this does not mean Americans ...

While levothyroxine remains essential for many patients with thyroid disorders, the medical community is shifting its focus to ensure that treatments do not come at the expense of overall well-being.

Levothyroxine is prescribed to treat hypothyroidism—an under-active thyroid—in approximately 23 million Americans, or 7 percent of the U.S. population, under various brand names, including ...

Levothyroxine is a frequently prescribed drug in the United States, particularly for older people, as lower thyroid function can be associated with aging. Questions remain over how appropriately ...