Bladder dysfunction occurs at some time in 70 to 90% of patients with multiple sclerosis and these patients are prone to have recurrent urinary tract infections (UTI), leading to an important morbidity. Cranberry has been traditionally used for the treatment and prevention of UTI and research suggests that its mechanism of action is preventing bacterial adherence to host cell surface membrane.
However, systematic reviews show the small sample sizes and the poor quality of available trials, determining that there is no reliable evidence of effectiveness of cranberry in UTI prophylaxis. Therefore, to assess whether cranberry is effective in reducing UTI in patients with multiple sclerosis, we have designed a randomized, double-blind, placebo-controlled trial. Efficacy will be evaluated on the time to onset of a UTI in the first year of treatment.
