Administration, TopicalAnti-Inflammatory Agents, Non-SteroidalCyclooxygenase 2 InhibitorsIbuprofenCyclooxygenase InhibitorsDiclofenacNaproxenAspirinGastrointestinal DiseasesKetoprofenProstaglandin-Endoperoxide SynthasesCyclooxygenase 2SulindacAcetaminophenSulfonamidesPiroxicamThiazinesSulfonesPyrazolesCyclooxygenase 1IndomethacinLactonesAnalgesics, Non-NarcoticEtodolacNitrobenzenesStomach UlcerGastrointestinal HemorrhageSafety-Based Drug WithdrawalsPeptic UlcerOsteoarthritis