Ibuprofen

Ibuprofen is a medication in the nonsteroidal anti-inflammatory drug (NSAID) class that is used for treating pain, fever, and inflammation. This includes painful menstrual periods, migraines, and rheumatoid arthritis. It can be used by mouth or intravenously. It typically begins working within an hour.

Side Effects
Using nonsteroidal anti-inflammatory precautions is recommended to avoid gastrointestinal side effects. Hepatic and renal dysfunction may occur, and peripheral edema. Central nervous system side effects include "dizziness, headaches, drowsiness and evidence of hypersensitives."

More commonly reported ones are:
 * Gastrointestinal side-effects including bleeding.

More commonly reported ones in children are:

Less commonly reported ones are:

Evidence
The Canadian Consensus Criteria suggests this drug for ME/CFS pain.

Dose
A dose of 200mg, as needed, up to 4 times a day, is suggested by the Canadian Consensus Criteria.