Ibuprofen (marketed under brand names such as Motrin^®, Advil^®, Genpril^®, and Nuprin^®) is a medication used to relieve pain, inflammation, fever, and stiffness. The drug is often used to treat conditions such as osteoarthritis, rheumatoid arthritis, and painful menstrual periods as well as general pain and fever. Available in prescription and non-prescription strengths, ibuprofen is thought to work by blocking the effects of certain hormones that cause inflammation and pain in the body. The drug is sold either by itself or combined with other medications for treating the common cold, flu, migraine, and sinus pain.