The purpose of this study is to investigate whether a fixed dose combination (FDC) capsule of esomeprazole 20 mg and acetylsalicylic acid (ASA) 81 mg has equivalent therapeutic efficacy compared to each of 2 free combinations of ASA tablet 81 mg plus esomeprazole 20 mg in patients at risk of gastrointestinal events using low dose ASA for cardiovascular protection.

Inclusion Criteria:

• Non-smoking male and female subjects, aged 18 years or older with a documented history of uncomplicated peptic ulcer(s), or aged 65 years or older
• Body Mass Index (BMI = weight/height2) greater than or equal to 18.5 kg/m2 and less than or equal to 35.0 kg/m2

Exclusion Criteria:

• Known history of hypersensitivity to esomeprazole (e.g. Nexium®) or related drugs such as omeprazole (e.g. Losec®, Prilosec®), lansoprazole (e.g. Prevacid®, Hp-PAC®), pantoprazole (e.g. Pantoloc®, PANTO® IV), or rabeprazole (e.g. Pariet™), a known hypersensitivity to ASA (e.g. Aspirin®) and/or related drugs such as ibuprofen (e.g. Motrin®, Advil®), indomethacin (e.g. Indocin®), diclofenac (e.g. Voltaren®), naproxen (e.g. Aleve®, Naprosyn®), or ketoprofen (e.g. Rhovail®).
• Significant history of pulmonary, endocrine, musculoskeletal, neurological, hematological, liver or kidney disease, or gastrointestinal disease (with the exception of uncomplicated peptic ulcer), unless deemed NCS by the Principal Investigator or Sub-investigator