<prompt> Centrally acting sympatholytic agent used as antihypeensive agent isPropanololClonidinePrazosinPhenoxybenzamine  <response>: Refer kDT 6e p540 Clonidine, sold as the brand name Catapresamong others, is a medication used to treat high blood pressure, attention deficit hyperactivity disorder, drug withdrawalalcohol, opioids, or smoking, menopausal flushing, diarrhea, and ceain pain conditions. It is used by mouth, by injection, or as a skin patch. Onset of action is typically within an hour with the effects on blood pressure lasting for up to eight hours 