Levothyroxine (Synthroid) is the drug of choice for thyroid replacement therapy in clients with hypothyroidism...

Levothyroxine is safe and effective with virtually no side effects when dosed properly. A single, daily dose is possible because of the long half-life (7 days). Levothyroxine tablets are available in a wide range of concentrations to meet individual client requirements. Levothyroxine (T4) is a prodrug of T3.Pharmacological Therapies