Antipyretic Analgesics: Salicylates ( e.g. Aspirin, Methyl salicylates ) Acetanalide ( e.g. Paracetamol , known in the US as acetaminophen or simply APAP ) Anthranilic acid derivatives ( e.g. Ponstan ) Opioid drugs such as morphine and oxycodone Salicylates: Salicylic acid it self used as potent analgesic but has gastric irritation so the derivative of salicylic acid are produced to reduce the gastric toxicity . Derivative of salicylic acid are the salts of carboxyl group as well as acetyl derivative of salicylic acid. Aspirin ( Acetyl salicylic acid , Dispirin ) Methyl salicylates ( Wintogeno balm ) Aspirin: ( Acetyl Salicylic acid ) Brand name : Dispirin Active Ingredient : Aspirin IUPAC name : Methyl 2- hydroxybenzoate Molecular formula : C 8 H 8 O 3 Structural formula of Dispirin : Aspirin + Na -citrate + NaHCO 3 Synthesis:retic analgesics ...