Psychological and physiological withdrawal symptoms and some positive factors were studied in 10 methadone maintenance treatment patients during methadone dose reduction. The subjective ratings were made during a period of 10 days around each reduction occasion, 3 days before dose reduction and 7 days after (i.e., within the periods). To permit comparisons of the subjects' ratings between earlier and later stages of the dose reduction process, a division has been made between the first half and the second half of the total reduction occasions (i.e., between the periods). Three of the patients completed the dose reduction, while the others interrupted their withdrawal attempts. The results show that the aggregate psychological symptoms were rated low, but that, as expected, they increased significantly from the first to the second half of the dose reduction. A significant increase of the psychological symptoms also occurred from the days before each reduction to the days after. The aggregate physiological symptoms were rated very low. A significant increase in rated withdrawal intensity is found within the reduction occasions. There were no significant changes with regard to the aggregate positive factors, either within or between the reduction occasions.