NUROFEN PLUS tablets contain the active ingredients Ibuprofen and Codeine phosphate. Ibuprofen belongs to a family of medicines called non-steroidal anti-inflammatory drugs (NSAIDS). These medicines work by relieving pain and/or inflammation (swelling, redness, soreness) and fever.hen you must not take it. Do not take NUROFEN PLUS if. 1  you have an allergy to: 2  Ibuprofen, codeine or other opioids, or any of the ingredients listed at the end of this leaflet. 3  any medicine containing ibuprofen, aspirin or other NSAIDs. 4  asthma, wheezing or shortness of breath.