Anti-Inflammatory Agents, Non-SteroidalUpper Gastrointestinal TractPiroxicamDiclofenacIbuprofenCyclooxygenase 2 InhibitorsSulfonamidesNaproxenGastrointestinal DiseasesCyclooxygenase InhibitorsAspirinThiazinesFlurbiprofenStomach UlcerPeptic UlcerKetoprofenPeptic Ulcer HemorrhageSulfonesGastrointestinal HemorrhageAcetaminophenButanonesCyclooxygenase 2MisoprostolLactonesProton Pump InhibitorsAnti-Ulcer AgentsPyrazolesKetorolacArthritisIntestinal DiseasesProstaglandin-Endoperoxide SynthasesCyclooxygenase 1Stomach DiseasesEtodolacOsteoarthritisAnalgesics, Non-NarcoticDuodenal UlcerClonixin