Cox-2 Inhibitors (Cox-2 inhibitor drugs) are prescription drugs used to treat the pain of arthritis conditions, menstrual cramps, and acute injuries such as sport injuries. Common side effects of COX-2 inhibitors are sinusitis, headache, flatulence, and insomnia. COX-2 vs. NSAIDs, drug interactions, and dosing information are provided. Cross-cultural psychology is a branch of psychology that looks at how cultural factors influence human behavior. While many aspects of human thought and behavior are universal, cultural differences can lead to often surprising differences in how people think, feel, and act.