Subjective Opiate Withdrawal Scale (SOWS) scores in 174 opioid-dependent inpatients undergoing 6-day methadone detoxification. Compared with non-problem drinking, problem drinking was associated with significantly greater withdrawal: repeated-measures analysis of variance, change of scores, F(1, 171) = 11.1, p = .001. PD-OD = problem drinking-opioid dependent patients; N-PD-OD = non-problem-drinking-opioid dependent patients.