This study will test prucalopride (a prokinetic drug currently approved by Health Canada for treatment of constipation) as a treatment for Ineffective Esophageal Motility (IEM). Adult patients with previously diagnosed IEM will be invited to participate by the investigators. The participants will take the study medication for 5 days and on the final day of medication undergo an esophageal manometry procedure at the Calgary Gut Motility Centre to measure esophageal function. Symptoms and side effects will be tracked at baseline and on Day 5.