An analgesic is any member of the diverse group of drugs used to relieve pain . The word analgesic derives from Greek an- and -algia . Analgesic drugs act in various ways on the peripheral and central nervous systems; they include paracetamol , the non-steroidal anti-inflammatory drugs such as the salicylates, narcotic drugs such as morphine, synthetic drugs with narcotic properties such as tramadol, and various others. In choosing analgesia,...