Characterization of benzodiazepine withdrawal in high- and low-dose dependent psychiatric inpatients.

Fourteen patients with high- (n = 7) and low-dose (n = 7) benzodiazepine (BDZ) dependency presented predominantly with anxious and depressive neurotic symptoms which caused long-term BDZ medication. Their BDZ dependency was characterized by giving preference to the abuse of benzodiazepines with long elimination half-life. Significant enlargement of CSF spaces was only found in high-dose dependent patients. Withdrawal after long-term BDZ medication revealed no differences between high- and low-dose BDZ dependency with respect to onset of withdrawal reaction and the correlation between onset of withdrawal and peak fall of BDZ serum level. The peak of withdrawal was reached 3-4 days later in high-dose BDZ dependent patients compared with those with a low-dose dependency. The peak withdrawal in high-dose dependent patients appeared when the serum BDZ metabolite nordiazepam dropped significantly. No such concomitant appearance of peak withdrawal and drop of serum nordiazepam level could be found in low-dose dependent patients. Specificity and intensity of BDZ withdrawal symptoms were the same for those dependent upon high doses of BDZs and those dependent upon low doses, but a protracted withdrawal was only observed in low-dose BDZ-dependent patients. During the withdrawal period psychopathometric measurements consistently revealed parallel changes in the scores for physical withdrawal symptoms, anxiety and depression. It is not clear whether anxiety and depression are "typical" BDZ withdrawal reactions or represent a "reactivated" state of the psychopathological disturbance which lead to the BDZ dependency. Possible implications for the therapeutical management of BDZ-dependent patients are discussed.