Possible predictors of response to clonazepam augmentation therapy in patients with protracted depression.
BACKGROUND
Clonazepam has been shown to be an effective supplementary treatment for depression. Thus, it would be useful to determine which patient characteristics are associated with response to clonazepam.


OBJECTIVE
The purpose of this study was to examine the possible predictors of response to clonazepam in the treatment of depression.


METHODS
A retrospective cohort analysis was carried out in 120 patients with protracted depression who were being treated with clonazepam.


RESULTS
A variety of clinical factors, including age, gender, type of depression, frequency of episodes, family history; and daily dose of clonazepam, were analyzed as possible predictors of response to clonazepam. A Weibull regression analysis showed that the factors that best predicted improvement with clonazepam augmentation were negative family history of psychiatric illness (e(coef) = 0.378), daily clonazepam dose of 2.5-4.0 mg (e(coef) = 0.160), and unipolar depression (e(coef) = 0.147).


CONCLUSIONS
These factors should be considered when clonazepam augmentation therapy is selected for protracted depression.
Morishita
Shigeru
S
Depression Prevention Medical Center, Kyoto Jujo Rehabilitation Hospital, Kyoto, Japan. s.morishita31@r9.dion.ne.jp
Arita
Seizaburo
S
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000927:Anticonvulsants / Q000008:administration & dosage*; D000928:Antidepressive Agents / Q000008:administration & dosage*; D001714:Bipolar Disorder / Q000175:diagnosis / Q000188:drug therapy* / Q000235:genetics / Q000523:psychology; D002908:Chronic Disease; D002998:Clonazepam / Q000008:administration & dosage*; D015331:Cohort Studies; D003865:Major Depressive Disorder / Q000175:diagnosis / Q000188:drug therapy* / Q000235:genetics / Q000523:psychology; D004305:Dose-Response Relationship, Drug; D004359:Drug Therapy, Combination; D005260:Female; D018757:GABA Modulators / Q000008:administration & dosage*; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D010555:Personality Inventory; D012189:Retrospective Studies; D016896:Treatment Outcome
D000927:Anticonvulsants; D000928:Antidepressive Agents; D018757:GABA Modulators; D002998:Clonazepam