- Use of aspirin or non-steroidal anti-inflammatory drugs (NSAIDs) [e.g. ibuprofen (Advil, Motrin, Nuprin), naproxen (Aleve, Naprosyn), and COX-2 inhibitors (Celebrex)] within one week prior to the study, and/or intent to use these drugs during the 2-week period of the study.