Lanreotide is primarily used in the treatment of acromegaly, a condition caused by excessive growth hormone production. It helps to reduce growth hormone levels and alleviate symptoms such as abnormal growth of hands, feet, and facial features. Additionally, it is effective in managing symptoms of neuroendocrine tumors, particularly carcinoid tumors, by controlling hormone-related symptoms like flushing and diarrhea. Lanreotide is also utilized in the management of thyrotropin-secreting pituitary adenomas, where it helps regulate thyroid hormone levels. It works by mimicking somatostatin, a natural hormone that inhibits the release of several other hormones, thereby providing therapeutic benefits in these conditions.