Multiple sclerosis (MS) is the commonest disabling neurological disease in young adults. A majority of patients experience bowel dysfunction, reporting a wide spectrum of bowel symptoms that significantly negatively impact social activities and emotional state. Transanal irrigation (TAI) is a method of managing such bowel symptoms. We aimed to investigate long-term efficacy of TAI, to measure health status-related quality of life and identify factors predictive of TAI outcome.