The maximum daily dosage of ibuprofen varies depending on whether it is taken as an over-the-counter (OTC) or a prescription medication. For adults using OTC ibuprofen, the maximum recommended dose is generally 1200 mg per day , typically divided into doses of 200-400 mg every 4-6 hours. For prescription use, especially for conditions like rheumatoid arthritis or osteoarthritis, the daily maximum can be higher, up to 2400 mg to 3200 mg per day, divided into three or four doses, but this should only be done under medical supervision. Taking more than these doses can increase the risk of side effects such as gastrointestinal bleeding and other complications. For children, the dosage is calculated based on body weight, with a maximum of about 30-40 mg/kg per day divided into multiple doses. It is important not to exceed these recommended limits and to consult a healthcare provider if higher doses are necessary or if ibuprofen is used for more than a few days continuously.