Hi, XIFAXAN can be taken as 200 mg or 550 mgs three times a day. The recommended dose of XIFAXAN is one 550 mg tablet taken orally two times a day, with or without food. Studies show that rifaximin eradicates bowel overgrowth syndrome in as many as 80% of patients. Higher doses (1200 or 1600 mg/d) are found to be more effective, hence your doctor has prescribed that does, please follow up with him. Regards.
Thank you so much for responding.