Pattern of self-administered paracetamol and codeine analgesic consumption after mandibular third-molar surgery.

Pattern of analgesic consumption after unilateral mandibular third-molar surgery was investigated in an open study in 201 patients. All patients were supplied with six analgesic tablets containing 500 mg paracetamol and 30 mg codeine. Instructions for use were given. A mean consumption of 4.9 tablets over the 1st week and 3.6 tablets the day of operation was found. Eight (4%) patients indicated inadequate or no effect of the medication. The remaining patients were able to control pain, to a level of one-third of maximum pain, by using from one to five tablets. One hundred and thirty-two (68%) patients followed instructions with regard to start of medication. No difference in mean tablet consumption was found between compliant patients and those who delayed the intake of the first analgesic dose by more than 1 h. Predictor analysis showed the most powerful predictors to be preoperative depth of the third molar and moderate or heavy smoking. Thirteen per cent explanatory power of all predictors together was found.