15-hour intra-oesophageal pH monitoring and symptom scores were used to compare the effect of cimetidine, 1 or 2 g daily with placebo on patients with acid gastrooesophageal reflux. Night pain and antacid consumption were reduced by cimetidine, but other symptoms did not show significant differences. Symptomatic improvement appeared greater in smokers than non-smokers. 15-hour intra-oesophageal pH measurements showed that the number of reflux episodes was reduced in the cimetidine-treated groups.

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