Abstract
There is a clear relationship between single doses of ibuprofen over the range 50-400 mg and the peak analgesic effect and the duration of analgesia. The smallest clinically useful dose of ibuprofen is 200 mg. Ibuprofen 400 mg has been shown to be as effective as aspirin 600 or 900 mg/day in models of moderate pain but superior to aspirin or paracetamol in more sensitive models such as dental pain. The duration of action of ibuprofen 400 mg is at least 6 hours compared with 4-6 hours for ibuprofen 200 mg or paracetamol. In patients undergoing oral surgery, ibuprofen 200 mg was broadly comparable with naproxen 220 mg and ibuprofen 400 mg comparable with ketoprofen 25 mg. The combination of ibuprofen and hydrocodone is more effective than either drug alone in patients undergoing abdominal and gynaecological surgery. The absorption of ibuprofen acid is influenced by formulation, and certain salts of ibuprofen (lysine, arginine, potassium) and solubilised formulations have an enhanced onset of activity. These differences are clinically important, offering a shorter time to onset of relief of tension headache compared with paracetamol.
