Nonsteroidal anti-inflammatory drugs (NSAIDS) are often associated with gastric ulcers. This study looks at the treatment of these gastric ulcers with one of the three following treatment groups: esomeprazole 40 mg once daily; esomeprazole 20 mg once daily; or ranitidine 150 mg twice daily.

Inclusion Criteria:

1. A clinical diagnosis of a chronic condition (eg osteoarthritis or rheumatoid arthritis) that requires daily NSAID treatment for at least 2 months.
2. Other key inclusion criteria, as specified in the protocol.

Exclusion Criteria:

1. History of esophageal, gastric or duodenal surgery, except for simple closure of an ulcer.
2. History of severe liver disease, including (but not limited to) cirrhosis and acute or chronic hepatitis.
3. Other conditions and criteria, as specified in the protocol.