pepper spray (also called oc spray, from oleoresin capsicum) is a spray used for self-defence, by spraying it into an attacker's face. it makes eyes water and causes intense pain, sometimes even leading to temporary blindness. pepper spray is an inflammatory agent. when someone is sprayed with pepper spray, their eyes will close and they will have difficulty breathing, a runny nose, and cough. the stronger the spray is, the longer the effects last, but the average full effect lasts around thirty to forty-five minutes, with longer effects lasting for hours. pepper spray is mostly used by police forces for riot control, but in some countries people can use it for self-defence.