PRX may refer to: Pressure reactivity index, a medical tool for monitoring patients with acute brain injuries PRX (telephony), a telephone switching platform developed by Philips Public Radio Exchange, a former Web-based public-radio distribution company, now merged with Public Radio International PRX (gene), periactin (PRX is the current official symbol) Peroxiredoxins, a family of enzymes (PRX is an older alias symbol) Physical Review X, a scientific journal published by the American Physical Society PRX, the IATA airport code for Cox Field Airport in Paris, Texas, United States A file extension for PlayStation Portable firmware