IN 2007, an international panel convened by the American Urological Association (AUA) and the European Association of Urology (EAU) updated the AUA ureteral stone guidelines. Most notably, the new guidelines reflect a pragmatic addition to the urologist's armamentarium: medical expulsive therapy (MET). MET is defined as the use of pharmaceutical agents to improve urinary stone passage rates and the time to stone passage in select individuals.