Treatment-naive H pylori-positive individuals were randomly assigned to a 10-day regimen ( oral twice-daily doses ) with rabeprazole ( 20 mg ) : standard triple therapy ( proton pump inhibitor , added clarithromycin [ 500 mg ] and amoxicillin [ 1 g ] [ PPI-CA ] ) ; sequential therapy ( ST ) added amoxicillin ( 1 g ) on days 1 to 5 , and metronidazole ( 500 mg ) and clarithromycin ( 500 mg ) on days 6 to 10 .