to medically as analgesic, but in plain, simple English they are known as pain medicine. Analgesic drugs act in various ways on the  peripheral  and  central  nervous systems; they include  paracetamol  (para-acetylaminophenol, also known in the US as acetaminophen), the non-steroidal anti-inflammatory drugs  (NSAIDs) such as the  salicylates , and  opioid