Ibuprofen Pain Killer is a medication that is used for the treatment of Pain, fever, and inflammation caused by a headache, back pain or injury. This also includes treatment of painful and irritating menstrual cycle and migraines. It affects begins within an hour. But besides its lots of benefits, it has side-effects too. Common side effects include heartburn and rash. It also creates gastrointestinal bleeding. Higher doses of Ibuprofen can cause heart attack too. It worsens asthma. In later stages of Pregnancy, Ibuprofen is harmful and therefore not recommended. It is also not recommended to a person suffering from the Chicken pox.