<prompt> All of the following agents are used in obesity EXCEPT :OrlistatSibutramineOlestraNeuropeptide Y analogues  <response>: Drugs used for the treatment of obesity are:FenfluramineSibutramine serotonin and NA reuptake inhibitorSucrose polyester olestraβ3 agonistsDexfenfluramineOrlistat a Pancreatic lipase inhibitorNeuropeptide Y antagonists 