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An analgesic or painkiller is any member of the group of drugs used to achieve analgesia, relief from pain.  Analgesic drugs act in various ways on the peripheral and central nervous systems. They are distinct from anesthetics, which reversibly eliminate sensation. Analgesics includeparacetamol (known in the US as acetaminophen or simply APAP), the non-steroidal anti-inflammatory drugs (NSAIDs) such as the salicylates, and opioid drugs such asmorphine and oxycodone.

Major classes

  • Paracetamol and NSAIDs
  • COX-2 inhibitors
  • Opioids
  • Flupirtine
  • Specific agents

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