How Much Advil Can an Adult Take Per Day?

Adults who suffer with osteoarthritis or rheumatoid arthritis can take 400 to 800 milligrams of Advil every six to eight hours. Women who are having menstrual cramps can take 400 milligrams of Advil every four hours, says Mayo Clinic. Advil dosage per day changes depending on the reason for taking the medication, age and weight; therefore, this medication should be used under the guidance of a doctor.