<prompt> Anitibiotic that improves gastroparesis is:CiprofloxacinErythromycinChloramphenicolVancomycin  <response>: Macrolide antibiotics such as erythromycin directly stimulate motilin receptors on gastrointestinal smooth muscle and promote the onset of a migrating motor complex. Intravenous erythromycin 3 mgkg is beneficial in some patients with gastroparesis; however, tolerance rapidly develops. It may be used in patients with acute upper gastrointestinal hemorrhage to promote gastric emptying of blood before endoscopy. Ref: Katzung 11th edition Chapter 60. 