Both ibuprofen and acetaminophen work to reduce fever and pain and can relieve mild to moderate pain, such as headache, toothache, migraine, neuralgia, muscle pain, joint pain, menstrual cramps, and can also be used to treat colds, including fever, sore throat, headache, and body muscle aches that occur with the common cold and influenza. Both ibuprofen and acetaminophen are recommended by the World Health Organization as fever reducers with relatively few side effects, and are available in a variety of oral dosage forms that can be used by adults and children. Acetaminophen, also known as paracetamol, and ibuprofen are both antipyretic and anti-inflammatory drugs, the mechanism of action is to inhibit the synthesis of prostaglandins in the body to reduce fever and relieve pain, and are allopathic drugs, only used to relieve symptoms, only to treat the symptoms, not the root cause, can not be long-term application. It is used to reduce fever for no more than 3 days in a row, and for pain relief for no more than 5 days in a row.