Motrin is the trade name of a type of drug called ibuprofen, according to the Motrin website and Drugs.com. It is a nonsteroidal anti-inflammatory drug used to reduce inflammation, lower fever and reduce pain.
Motrin is used for a number of conditions including headaches, toothaches and back pain, as described by Drugs.com. The Motrin website itself lists these conditions as well, along with a number of conditions it says its children's version is suitable for treating. It has been available by prescription in the United States since 1974. Motrin became available as an over-the-counter drug 10 years later. The children's version has been available since 1995.