Carbimazole is primarily used in the treatment of hyperthyroidism, a condition where the thyroid gland produces excessive amounts of thyroid hormones. It works by inhibiting the synthesis of these hormones, helping to restore normal levels in the body. This medication is often prescribed for conditions such as Graves' disease, a common cause of hyperthyroidism. By controlling the overactive thyroid, carbimazole alleviates symptoms like weight loss, rapid heartbeat, tremors, and anxiety. It is typically administered orally and requires regular monitoring of thyroid function to adjust the dosage as needed. In some cases, it may be used as a preoperative treatment to stabilize thyroid levels before surgical intervention.