Irritable Bowel Syndrome With Diarrhea Clinical Trial
Official title:
A Study to Assess Repeat Treatment Efficacy and Safety of Rifaximin 550 mg TID in Subjects With Irritable Bowel Syndrome With Diarrhea (IBS-D)
This study will evaluate the effectiveness and safety of repeat treatment with rifaximin 550 mg three times a day in patients with IBS with diarrhea who respond to initial treatment of rifaximin 550 mg three times a day.
It is important in chronic conditions to have information about how a product that is
intended for short course administration in order to confer prolonged benefit should be
administered beyond the first cycle of use once symptoms reappear. This Phase 3 study will
evaluate the efficacy and safety of repeat treatment with rifaximin 550 mg three times daily
(TID) for 14 days in subjects with IBS-D who respond to an initial treatment course with
rifaximin 550 mg TID for 14 days.
This study consists of several treatment phases outlined below:
Screening/Treatment 1 Phase. Subjects will receive single-blind placebo TID for 7-13 days and
answer daily IBS symptom-related questions.
Treatment 2 Phase. Eligible subjects will receive open-label rifaximin 550 mg TID for 2 weeks
with a 4-week treatment-free follow-up. Responders will continue into Maintenance Phase 1.
Nonresponders will withdraw from the study.
Maintenance Phase 1. Subjects will continue the treatment-free follow-up period for up to 18
weeks until either: 1) they experience recurrence or 2) enrollment is met in the Treatment 3
Phase (Double Blind Repeat Treatment Phase). Subjects who do not meet recurrence criteria by
the end of the Maintenance Phase 1 will withdraw from the study.
Treatment 3 Phase/ Double Blind Repeat Treatment Phase. Subjects who meet criteria for
recurrence will be randomized 1:1 to receive either rifaximin 550 mg TID or placebo TID for 2
weeks with a 4-week treatment-free follow-up.
Primary efficacy analysis will be performed at the end of the Treatment 3 Phase (at Week 6 of
the double-blind period).
Maintenance Phase 2. All subjects continued into an additional treatment-free follow-up
period of up to 6 weeks (Maintenance Phase 2).
Treatment 4 Phase/Second Repeat Treatment Phase. Subjects will receive the same double-blind
treatment as previously assigned in the Treatment 3 Phase for 2 weeks with a 4-week
treatment-free follow-up.
A lactulose breath test sub-study will be conducted at select sites.
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