Ibuprofen is a nonsteroidal anti-inflammatory drug that is used to treat symptoms caused by arthritis, such as swelling, pain, and stiffness. This drug is widely available without prescription and is marketed under a variety of trade names including Advil, Nuprin, and Motrin. Ibuprofen is also often used to reduce fever and many people take it as a painkiller, although it has not been demonstrated to have remarkable effects on headaches. Side effects include fainting, irregular heartbeat, shortness of breath, and tightness in the chest.