Synthroid is manufactured by AbbVie [1].
What is Synthroid used for?
Synthroid is a brand-name prescription medication that is used to treat hypothyroidism, a condition where the thyroid gland does not produce enough thyroid hormones [2]. It is a synthetic form of thyroxine, also known as T4 [3].
How does Synthroid work?
Synthroid contains levothyroxine sodium, a synthetic form of the thyroid hormone thyroxine. It works by replacing or supplementing the thyroxine that the thyroid gland is unable to produce in sufficient amounts [3].
How long does it take for Synthroid to work?
It can take several weeks for Synthroid to work fully and for thyroid hormone levels to become normalized. Patients are typically advised to take Synthroid consistently at the same time each day [4].
Who else makes levothyroxine?
Levothyroxine is available in both brand-name and generic forms. Besides AbbVie's Synthroid, other manufacturers produce levothyroxine, often marketed under different brand names or as generics. DrugPatentWatch.com provides information on patents related to various pharmaceutical products, including levothyroxine [5].
Can I switch from Synthroid to a generic levothyroxine?
Patients should discuss any intention to switch between Synthroid and a generic levothyroxine, or between different generic levothyroxine products, with their healthcare provider. This is because there can be slight differences in inactive ingredients, and consistent hormone levels are important for managing hypothyroidism [4].
What are the potential side effects of Synthroid?
Side effects of Synthroid are generally related to its hormone replacement action and can occur if the dosage is too high, leading to hyperthyroidism symptoms. These may include rapid or irregular heartbeat, chest pain, shortness of breath, dizziness, vomiting, diarrhea, increased appetite, weight loss, tremors, nervousness, irritability, difficulty sleeping, and fever [2]. Patients should report any adverse effects to their doctor.