For pain and menstrual cramps, the average recommended dose for ibuprofen is 400 milligrams every four to six hours in adults and teenagers, according to Mayo Clinic. For children, dosage is based on body weight, and should be confirmed with a doctor.
The recommended dosage can change, depending on the reason for using ibuprofen. When using ibuprofen to treat the symptoms of osteoarthritis or rheumatoid arthritis, the recommended dosage can range from 1200 to 3200 milligrams for adults. It is best to follow a doctor's instructions when taking ibuprofen. Taking more ibuprofen than necessary, whether by way of dose size, frequency or duration, can decrease its effectiveness and increase the chances of experiencing negative side effects, notes Mayo Clinic.