50 mcg Thyroxine Sodium Tablets are synthetic thyroid hormones. They contain thyroxine which is a synthetic thyroid hormone similar to thyroxine developed by the thyroid gland. They replace the thyroid hormone in the body when the production of thyroid hormones is not sufficient naturally. They are prescribed for treating hypothyroidism or low secretion of thyroid hormone. These 50 mcg Thyroxine Sodium Tablets work by replacing the missing thyroid hormone to provide relief on the thyroid gland.