Thyronorm 75 mcg contains levothyroxine sodium, a synthetic version of the thyroid hormone thyroxine (T4). It works by replacing or supplementing the insufficient thyroid hormones in the body, which are essential for regulating metabolism, energy production, and overall growth. When taken, Thyronorm 75 mcg helps restore normal thyroid hormone levels, improving symptoms of hypothyroidism such as fatigue, weight gain, and depression. The medication is typically taken once daily, in the morning, on an empty stomach for best absorption. The dosage is personalized based on blood tests that measure thyroid function, and it may be adjusted over time. Regular monitoring by a healthcare provider is necessary to ensure the correct dosage and to avoid complications like over- or under-treatment.