Synthroid (Levothyroxine, T4)
Purpose of Medication and Method of Action
Synthroid is used to treat hypothyroidism (low thyroid function). Hypothyroidism is characterized by lethargy, weight gain, and drowsiness. Synthroid acts by providing one of the thyroid gland products which is used by the body to control basic metabolism.
Side Effects
Side effects are unusual but a transient loss of hair during the first few months of therapy may occur.
Drug Interactions
Absorption of Synthroid may be decreased by aluminum hydroxide, cholestyramine resin, ferrous sulfate, and sucralfate. The addition of Synthroid to existing therapy with warfarin (Coumadin), oral antidiabetic drugs, and digoxin may decrease the effectiveness of those drugs.
Cautions and Contraindications
In presence of thyrotoxicosis and adrenal insufficiency.
Usual Dose
The dose is individualized and dependent on thyroid function studies performed in your physicians office. The most common dose range for adults is 0.05-0.150 mg each day.
Patient Medication Information
These information sheets do not list all known side effects of the medications, only the most common side effects. For a complete list of side effects please contact your local pharmacy or the actual drug manufacturing company.