The patients will report their individual dyspeptic symptoms on weekly basis using a self-administered symptom questionnaire. At week 4 and week 8, they will need to give an additional rating on their overall symptom response using global symptom assessment. The patients are required to give a dichotomous response of either "yes" or "no" to the question stating "Do you have adequate relief of symptoms over the past 7 days?". Satiety test and blood sampling, gastric emptying study will be repeated at the end of 8-week treatment.