A pharmacokinetic study evaluating naproxen and esomeprazole blood levels in 4 treatments, each containing one or both components.

This study is being conducted to assess the relative bioavailability of naproxen and esomeprazole from a single dose of PN 400 (delayed-release naproxen 500mg / immediate-release esomeprazole 20mg), enteric-coated naproxen 500mg co-administered with enteric-coated esomeprazole 20mg, enteric-coated naproxen 500mg administered alone, and enteric-coated esomeprazole 20mg administered alone.

Inclusion Criteria:

• Healthy males and non-pregnant, non-lactating females who are either of non-childbearing potential or using an acceptable method of birth control.

Exclusion Criteria:

• Standard exclusion criteria for a study of this nature - no significant medical conditions that might affect the interpretation of the PK data or compromise the safety of the subject.