Ibuprofen molecule. Computer artwork showing the structure of a molecule of the painkilling (analgesic) drug ibuprofen. Ibuprofen is a non-steroidal anti-inflammatory drug (NSAID). It is taken as an analgesic (painkiller), and an antipyretic (reduces fever). Atoms are represented as spheres and are colour-coded: carbon (black), hydrogen (white), nitrogen (blue), and oxygen (red) - with the bonds between them as rods (silver).