RESULTS	A symptomatic response was found in 62 % of patients on cisapride ( therapeutic gain cisapride vs placebo : 0.1 % [ 95 % confidence interval -14 % to 14 % ] ) and in 54 % of patients on nizatidine ( therapeutic gain nizatidine vs placebo : -8 % [ 95 % confidence interval -22 % to 7 % ] ) .\