What is Motrin 800?

Motrin 800 is a brand name for 800-milligram ibuprofen tablets. Motrin is a pain reliever used to treat menstrual cramps, headache and muscle and back pain, according to Drugs.com. Motrin 800 is a nonsteroidal anti-inflammatory agent, or NSAID, and is available only by prescription.

The side effects of Motrin include anemia, dizziness, bloating, diarrhea, epigastric pain, heartburn and nausea, notes Drugs.com. Other side effects include dry mouth, infection, flatulence, rashes, increased bleeding time, headache and abnormal renal functions. Some users may experience fluid retention, constipation, rectal bleeding, nervousness and liver necrosis. Liver failure is also a potential adverse reaction from the use of Motrin, particularly with prolonged use.