Levothyroxine (Synthroid) is an oral medication used to treat hypothyroidism (underactive thyroid). It's a lab-made version ...

Hypothyroid patients are advised to take oral levothyroxine 30 min before breakfast, to aid its absorption. Bolk and colleagues had observed that some patients' thyroid-hormone profiles improved ...

in March of this year. Because Synthroid was marketed before 1962, it had never undergone FDA review. On August 14, 1997, FDA declared that no levothyroxine products had consistent potency and ...