 The purpose of this research project is to determine the effect of a drug called bethanechol on swallowing function in patients with Ineffective Esophageal Motility IEM. This drug is FDA approved for use in treating other conditions, but not for the treatment of IEM. There is currently no approved therapy for the treatment of IEM. This information is important for the possible development of new ways of treating patients with IEM and for the effectiveness of topically applied Bethanechol on patients with IEM. 