Dexmedetomidine is a medication primarily used for sedation in patients undergoing surgery or in intensive care settings. It works by activating alpha-2 adrenergic receptors in the brain, leading to a calming effect without causing significant respiratory depression. This drug is often preferred for its ability to provide sedation while allowing patients to remain somewhat alert and responsive. It is commonly administered intravenously and can be used in both adults and children, making it a versatile option in various medical situations.