Euthyrox 25 - 200 microgram :- Treatment of benign euthyroid goitre.- Prophylaxis of relapse after surgery for euthyroid goitre, depending on the post - operative hormone status.- Substitution therapy in hypothyroidism.- Suppression therapy in thyroid cancer.Euthyrox 25 - 100 microgram :- Concomitant supplementation during anti-thyroid drug treatment of hyperthyroidism.Euthyrox 100/150/200 microgram :- Diagnostic use for thyroid suppression testing.