DRUGS and PHARMACEUTICALS Analgesic Drugs An analgesic or pain killer is any member of the group of drugs used to achieve analgesia , relief from pain. The English word for pain is derived form the old French word 'piene' , Latin word 'poene' and Ancient Greek word 'poine'. Causes Of Pain: Following can be the reasons for any kind of pain; Stress Tension Coldness Lack of Oxygen Hotness Carrying heavy loads Definition Of Analgesics These are the class of compounds which relief the pain without the production of unconsciousness. There action may Peripheral Central Peripheral + Central Classification On The Basis Of Cause Of Pain On the basis of cause of pain the compounds are classified the following two classes True Analgesics: Those compounds which relief the pain may or may not be a...