after 1 and 2 years the relapse rate of duodenal ulcer was 17.5 % and 43.6 % respectively , for cimetidine , 21 % and 69.3 % for ranitidine , 21.7 and 50.2 % for pirenzepine , and 49.8 % and 77.7 % for antacids .
C0013295
duodenal ulcer
C0034665
ranitidine