• The purpose of the study is to access the effectiveness and safety of oral rabeprazole in the treatment of acid-related disorders in pediatric patients, focusing specifically on the manifestation of GERD (symptomatic and erosive types).

• The purpose of this study is to determine the safety and efficacy of Rabeprazole extended release (ER) 50 mg versus Esomeprazole 40 mg for healing and symptomatic relief among subjects with erosive gastroesophageal reflux disease (GERD).

This is placebo-controlled study of three rifaximin doses in patients with DIBS. Subjects will be randomized to receive daily doses of placebo BID, rifaximin 275 mg BID, rifaximin 550 mg BID, or 1100 mg BID for 14 days. These four groups will subsequently receive an additional two weeks of placebo for a total of 4 weeks of treatment. A fifth group of subjects will receive rifaximin 550 mg BID for a period of 28 days. Subjects who successfully respond to treatment at the end of the 28-day Treatment Phase will be followed in a Post-treatment Phase that includes study visits during Weeks 6, 8, 12 and 16. Subjects who relapse during the Post-treatment Phase will be discontinued from the study.