Anamorelin is primarily used in the treatment of cachexia, a condition often associated with cancer, chronic obstructive pulmonary disease (COPD), and other chronic illnesses. It works by stimulating appetite and promoting weight gain, particularly in patients who experience severe muscle wasting and loss of body mass. This helps improve their overall quality of life and physical strength, making it easier to withstand treatments like chemotherapy. Additionally, it has shown potential in improving lean body mass and reducing fatigue in patients with advanced cancer. Its role in managing cachexia makes it a valuable therapeutic option for individuals struggling with the debilitating effects of chronic diseases.