Diabetic Gastroparesis Efficacy/Safety Study of TZP-102

Inclusion Criteria: * 18 to 80 years of age inclusive * Type 1 or type 2 diabetes mellitus * History of symptoms of gastroparesis for at least 3 months leading up to the Screening Visit * Documented delayed gastric emptying * Upper gastrointestinal obstruction ruled out by endoscopy or barium scan * Concomitant medications must be stable for at least 2 weeks leading up to the Screening visit and must be maintained during the study. * Females of child-bearing potential must have a negative serum pregnancy test and use (and agree to continue to use throughout the study) an acceptable form of contraception Exclusion Criteria: * Gastrectomy, bariatric surgery, fundoplication or vagotomy/pyloroplasty * Has had or plans to have endoscopic pyloric injections of botulinum toxin within 6 months prior to the Screening Visit or during the study * NG, PEG or PEJ feeding tube or inpatient hospitalization for gastroparesis within 2 weeks prior to the Screening Visit * Required parenteral nutrition for treatment of gastroparesis within 2 months prior to the Screening Visit * Active gastric pacemaker within 3 months prior to the Screening Visit