Patient description: The patient is a 57-year-old man with abdominal pain and vomiting. The pain started gradually about 20 hours ago in the epigastric and periumbilical regions, radiating to his back. He drinks around 60 units of alcohol per week and smokes 22 cigarettes per day. He is healthy with no history of allergies or using any medications. His family history is positive for type 2 diabetes (his father and sister). He lives alone and has no children. The abdomen is tender and soft. His bowel sounds are normal. His heart rate is 115/min and blood pressure 110/75 mmHg. The lab results are remarkable for leukocytosis (19.5), urea of 8.5, high CRP (145), high amylase (1200) and Glc level of 15. Cross-sectional imaging was negative for obstructive pancreatitis.

Clinical trial eligibility criteria: eligible ages (years): 18.0-60.0,  Patients With Gastroparesis Who Have Failed Standard Therapy Male or Female 2. Age 18 3. Symptoms or manifestation secondary to gastroparesis such as vomiting, nausea, the feeling you are full after you start eating, and abdominal pain. 4. Subjects must have a comprehensive evaluation to eliminate other causes of their symptoms which includes gastric emptying scintigraphy, esophagogastroduodenoscopy (EGD), and the patient's subjective symptoms. 5. Subject has signed informed consent for the administration of domperidone that informs the patient of potential adverse events 6. Female subjects must be: 1. surgically sterile (have had a hysterectomy or bilateral oophorectomy, or tubal ligation) 2. if sexual active, practicing an effective method of birth control such as hormonal prescription oral contraceptives, progesterone implants or injections, contraceptive patch, intrauterine device, or maintenance of a monogamous relationship with a male partner who has been surgically sterilized by vasectomy. A double barrier method such as condoms, diaphragms, or cervical caps with spermicidal foam, cream, or gel may be used as a method of birth control  History of, or current, arrhythmias including ventricular tachycardia, ventricular fibrillation, atrial fibrilation and Torsade des Pointes, subjects with minor forms of ectopy (PACs) are not necessarily excluded 2. Clinically significant bradycardia, sinus node dysfunction, or heart block. Prolonged QTc (QTC>450 milliseconds for males, QTc>470 milliseconds for females) 3. Clinically significant electrolyte disorders 4. Gastrointestinal hemmorrhage or obstruction 5. Presence of a prolactinoma (prolactin-releasing pituitary tumor) 6. Pregnant or breast feeding female 7. Known allergy to domperidone The following medications are prohibited during the study: antidepressants: doxepin, clomipramine, amopxapine, trazodone, venlafaxine, nefazodone, fluvoxamine, paroxetine, fluoxetine, sertraline, amitriptyline, maprotiline, desipramine, nortriptyline, trimipramine, imipramine, protriptyline; anti-psychotics: haloperidol, chlorpromazine, chlorpromazine pimozide, sertindole, quetiapine, mesoridazine, perphenazine, lfluphenazine, promazine, trifluoperazine; anti-emetics: prochlorperazine, thioridazine, promethazine, mesoridazine, theiethylperazine, perphazine, dolasetron, dronabinol, droperidol; anti-infective agents: erythromycin, clarithromycin, troleandomycin, norfloxcin, quinine sulfate, quinupristin and dalfopristin, pentamidine, sparfloxacin, grepafloxacin, azithromycin, ofloxacin, levofloxacin; anti-fungal agents: fluconazole, itraconazole, ketoconazole, miconazole, terconazole, ticonazole, butaconazole; antivirals: foscarnet; protease inhibitors: indinavir, amprenavir, ritonavir, nelfinavir, squinavir; antihypertensives: nicardipine, isradipine, moexipril/HCTZ; calcium channel blockers: verapamil, diltiazem, deltiazem/enalapril, verapamil/trandolapril, tocainide, bepridil; anti-arrhythmics: disopyramide, quinidine, procainamide, flecainide, sotalol, bretylium, amiodarone, ibutilide, moricizine; diueretics: bumetanide, furosemide, torsemide, etharcrynic acid, chlorothiazide, indapamide; antilipemics: probucol, bepridil, mibefradil; hematological agents: cilostazol; respiratory agents: zafirlukast, salmetrol; gastrointestinal agents: cimetidine, cisapride; antidiarrheal: octreotide; antihistamines: azelastine, clemastine; migraine treatment: naratriptan, sumatriptan, zolmitriptan; antimalarial: halofantrine; muscle relaxants: tizanidine; narcotic dependence: levomethadyl; miscellaneous: tamoxifen, warfarin, phenytoin, ziprasidone, risperidone, formoterol fumarate, sildenafil; drugs that prolong the QT Interval: albuterol, alfuzosin, amantadine, amisulpride, amphetamine, arsenic trioxide, astemizole, atazanavir, atomoxetine, chloral hydrate, chloroquine, ciprofloxacin, citalopram, clozapine, cocaine, dexmethylphenidate, diphenhydramine, dobutamine, dofetilide, dopamine, dronedarone, ephedrine, epinephrine, eribulin, escitalopram, famotidine, felbamate, fenfluramine, fingolimod, fosphenytoin, galantamine, gatifloxacin, gemifloxacin, granisetron, iloperidone, isoproterenol, lapatinib, levalbuterol, lisdexamfetamine, lithium, metaproterenol, methadone, methylphenidate, midodrine, moxifloxacin, nilotinib, norepinephrine, ondansetron, oxytocin, paliperidone, perflutren lipid microspheres, phentermine, phenylephrine, phenylpropanolamine, protriptyline, pseudoephedrine, ranolazine, ritodrine, toxithromycin, sibutramine, solifenacin, sunitinib, tacrolimus, telithromycin, terbutaline, terfenadine, tolterodine, trimethoprim-sulfa, vandetanib, vardenafil, voriconazole