Thyronorm 75mcg tablet is similar to the hormone produced by the thyroid gland. It is primarily used to treat Hypothyroidism, a condition where the thyroid gland does not produce sufficient quantities of hormones. Generic for Synthroid (Levothyroxine) is used to treat hypothyroidism (low thyroid hormone). This medicine helps reduce the symptoms of low thyroid hormone such as sensitivity to cold, weight gain, dry skin, and lack of energy.