Clonidine hydrochloride is an alpha-2 adrenergic agonist medication primarily used to treat high blood pressure by stimulating receptors in the brain stem, which reduces sympathetic nervous system outflow and relaxes blood vessels for easier blood flow. It is also indicated for attention deficit hyperactivity disorder (ADHD) in children as a non-stimulant option, often in extended-release form, and aids in managing symptoms of drug withdrawal from substances like opioids, alcohol, or nicotine by easing autonomic hyperactivity. Additional applications include alleviating menopausal hot flashes, certain pain conditions such as severe cancer pain, migraine headaches, and tics associated with Tourette syndrome, as well as refractory diarrhea in conditions like irritable bowel syndrome.