Inclusion Criteria:  Participants aged over 18 years Participants who have a history of gastric and duodenal ulcer falling under the approved indication for Pariet Tablet 5 mg and who are receiving Pariet Tablet 5 mg to prevent gastric and duodenal ulcer from low dose aspirin use of 100 mg or less daily Participants whose prescription of Pariet Tablet 5 mg has been determined before study participation Participants who have given written consent to the use of their personal and medical information  Exclusion Criteria:  Participants with a known hypersensitivity to rabeprazole sodium, any excipients used in the formulation or benzimidazole derivatives, and with the history of such hypersensitivity Participants administered with atazanavir Pregnant or lactating Participants administered with rilpivirine Participants currently participating in other clinical trials