Clonidine, sold as the brand name Catapres among others, is a medication used to treat high . are measured before and 3 hours after a 0.3 mg oral test dose has been given to the patient. .. 10 (2): 104–8. doi:10.1007/s11920-008-0019-0. Jump up to: CATAPRES® 150 TABLETS CATAPRES® AMPOULES (PDF)....