Role of Antibiotic Therapy in Crohn's Disease?

"No randomized clinical trial has found antibiotics to be effective for the induction or maintenance of remission in Crohn's disease.[1-4] Despite these negative trials, clinical experience has found that metronidazole and/or ciprofloxacin, especially in conjunction with immunosuppression, has long-term beneficial effects for inflammatory-type and fistula-type Crohn's disease."