Which medication is primarily used for appetite stimulation in elderly patients?

Mirtazapine, also known as Remeron, is primarily used for appetite stimulation in elderly patients. This medication is an atypical antidepressant that has been shown to have sedative effects and can increase appetite, making it beneficial for older adults who may be experiencing weight loss or decreased food intake due to depression, illness, or other factors related to aging.

Mirtazapine's action on specific serotonin and norepinephrine receptors helps to enhance appetite by modulating neurotransmitter levels that influence hunger and satiety. This can be particularly important in the geriatric population, where maintaining a healthy weight and proper nutritional intake is crucial for overall health and well-being.

The other medications mentioned, such as Metformin, are primarily used for managing blood sugar levels in diabetes; Aspirin, which is used for pain relief and cardiovascular protection; and Simvastatin, deployed to manage cholesterol levels, do not have a role in stimulating appetite. Therefore, they would not effectively address the issue of appetite stimulation in elderly patients.