 5 aminosalicylates, if the dose remained constant for 4 weeks before the screening visit and had been used continuously for 8 weeks before screening and the patient has previously flared whilst on the medication; Azathioprine6MP, if the dose remained constant for 8 weeks prior to the screening visit and had been used continuously for 12 weeks before screening and the patient has previously flared whilst on the medication. Proprietary probiotic preparations must be stopped at least two weeks prior to starting the trial preparation. 