(EN) Novel analgesic and anti-inflammatory compositions of matter for use in eliciting an analgesic or anti-inflammatory response, said compositions comprising xanthine together with a selected non-narcotic analgesic/nonsteroidal anti-inflammatory drug or a selected narcotic analgesic, or both. When used in combination with the selected drugs, such xanthine enhances the analgesic or anti-inflammatory response and also hastens its onset.