Euthyrox 150 mcg is a prescription medication containing levothyroxine sodium, manufactured by Merck. This pack contains 100 tablets and is used for thyroid hormone replacement therapy. Euthyrox contains levothyroxine sodium as the active ingredient and comes in tablet form. The 150 mcg strength indicates the dosage of levothyroxine in each tablet. As this is a prescription medication, it should only be taken under the supervision and guidance of a healthcare provider. The package contains 100 tablets with modified excipients.