Greek: an = not, without and algedon = pain. Analgesics is a collective term for pain-killing substances, which absorb the exciting barness of the pain centers in the brain. Because of the existing craze potential the transition is flowing towards the narcotics.
The strongest analgesics are the so-called narkoanalgetics, including the opioides attacking at the opiate receptors (morphine, hydromorphon, dihydrocodeine, oxycodon, etc.) but also fentanyl, piritramid, pethidine, pentazocine, buprenorphine and methadone.
Even less effective are those partly prescription- partly pharmacy-requiring analgesics/antirheumatics. This group includes both vegetable preparations and chemical substances with wide variations in their chemical structure like paracetamol and acetylsalicylic acid, in addition, especially against rheumatism, metamizole, phenylbutazon, diclofenac etc.