Clonidine hydrochloride is also indicated for the treatment of hypertension and can be used alone or in combination with other blood pressure lowering agents. At present, there are still clonidine transdermal patch in China for the treatment of children's vocal and multi-chemicalbook sports combined tic disorders. Clonidine can also be used for surgical anesthesia combined medication, in order to enhance the intensity and duration of the action of anesthesia drugs, and reduce the adverse reactions of anesthesia drugs.