How does Ibuprofen reduce fever?

ibuprofen is a non steroidal anti inflammatory drug which pretty much protects mucus linings. This keeps viruses from spreading as rapidly and the human immune system destroys the infection. This is,of cousre as most answers are, over-simplified,however,unless you are going into the medical field,that information is sufficient. Should you have anymore questions on drug names simply look up the drug type and you will be able to piece together how this interacts with the body. As you do this,please realize that it is a common misconception that the drug destroys the fever virus. It does not. Only the immune system can destroy virus. Drugs like ibuprofen merely make the conditions optimal for the immune system to act.