Anticholinergic Burden in Schizophrenia - Full Text View

Sponsor:	Centre for Addiction and Mental Health
Information provided by:	Centre for Addiction and Mental Health
ClinicalTrials.gov Identifier:	NCT00715377

Purpose

Anticholinergic antiparkinsonian agents often cause side-effects including cognitive impairment, dry mouth, and constipation while they diminish antipsychotic-induced parkinsonian symptoms. The introduction of second generation antipsychotics (SGA) brought fewer neurological side effects. However, anticholinergic coprescription rates are still as high as 12-65% in patients on SGA that are much higher than the incidence of EPS reported in clinical trials (3-20%). This apparently discrepancy is likely explained, in part, by the established tradition of routine use of this medications. Older patients are particularly sensitive to anticholinergic side-effects due to age-related changes in pharmacokinetics and pharmacodynamics. In this study, we will examine the safety and benefits of reducing the dose of a frequently prescribed anticholinergics, benztropine, on cognitive function, extrapyramidal symptoms, and psychotic symptoms in older subjects with a primary psychotic disorder.

Condition	Intervention
Schizophrenia Schizoaffective Disorder Schizophreniform Disorder Delusional Disorder Psychotic Disorders	Drug: Benztropine

Study Type:	Interventional
Study Design:	Treatment, Open Label, Single Group Assignment
Official Title:	Anticholinergic Burden in Schizophrenia

Resource links provided by NLM:

MedlinePlus related topics: Mental Health Psychotic Disorders Schizophrenia

Drug Information available for: Benztropine Benzatropine methanesulfonate

U.S. FDA Resources

Further study details as provided by Centre for Addiction and Mental Health:

Primary Outcome Measures:

percentage of participants who successfully withdraw from anticholinergic antiparkinsonian agents. [ Time Frame: at the end of the study ] [ Designated as safety issue: No ]

Secondary Outcome Measures:

effect of reducing the dose of benztropine on EPS and anticholinergic side-effects including cognitive impairments. [ Time Frame: intermittent ] [ Designated as safety issue: No ]

Enrollment:	2
Study Start Date:	June 2007

Arms	Assigned Interventions
1: Experimental	Drug: Benztropine Patients aged ≥ 50 years suffering from a primary psychotic disorder treated with a SGA and benztropine concomittantly at any dose steadily for at least 3 months will be eligible to participate in this study. The dose of benztropine will be reduced by 0.5mg per week. During this 8-week study period, extrapyramidal symptoms will be assessed on a weekly basis. The clinical assessments will be repeated 8 weeks after the initial assessments.

Arms

Assigned Interventions

1: Experimental

Drug: Benztropine

Patients aged ≥ 50 years suffering from a primary psychotic disorder treated with a SGA and benztropine concomittantly at any dose steadily for at least 3 months will be eligible to participate in this study. The dose of benztropine will be reduced by 0.5mg per week. During this 8-week study period, extrapyramidal symptoms will be assessed on a weekly basis. The clinical assessments will be repeated 8 weeks after the initial assessments.

Show Detailed Description

Eligibility

Ages Eligible for Study:	50 Years and older
Genders Eligible for Study:	Both
Accepts Healthy Volunteers:	No

Criteria

Inclusion Criteria:

Age of 50 and older
DSM-IV/SCID diagnosis of schizophrenia, schizoaffective disorder, schizophreniform disorder, delusional disorder, or psychotic disorder NOS
Having been treated with benztopine at a steady daily dose of 3 mg or less for at least three months
Having been treated with risperidone, quetiapine, olanzapine, or clozapine at a steady dose for at least two weeks.
Willingness to provide consent for investigator to communicate with their physician of record regarding their participation in the study.

Exclusion Criteria:

Unstable physical illness or clinically significant neurological disorder
A history of severe or life-threatening dystonia
Presence of EPS defined as a total score of 7 or more or a score of 3 or more on any individual item on the SAS at baseline
Positive urine drug screen for illegal drugs

Contacts and Locations

Please refer to this study by its ClinicalTrials.gov identifier: NCT00715377

Locations

Canada, Ontario
Centre for Addiction and Mental Health
Toronto, Ontario, Canada, M5T 1R8

Sponsors and Collaborators

Centre for Addiction and Mental Health

Investigators

Principal Investigator:

Hiroyuki Uchida, MD PhD

Centre for Addiction and Mental Health

More Information

Additional Information:

Information about research at the Centre for Addiction and Mental Health This link exits the ClinicalTrials.gov site

No publications provided

Responsible Party:	Centre for Addiction and Mental Health ( Hiroyuki Uchida, MD PhD )
Study ID Numbers:	118/2007
Study First Received:	July 11, 2008
Last Updated:	May 9, 2009
ClinicalTrials.gov Identifier:	NCT00715377 History of Changes
Health Authority:	Canada: Health Canada

Keywords provided by Centre for Addiction and Mental Health:

benztropine
Anticholinergic antiparkinsonian agents
antipsychotics
elderly population
side-effects

Additional relevant MeSH terms:

Dopamine Uptake Inhibitors
Parasympatholytics
Neurotransmitter Agents
Neurotransmitter Uptake Inhibitors
Cholinergic Antagonists
Molecular Mechanisms of Pharmacological Action
Anti-Dyskinesia Agents
Physiological Effects of Drugs
Antiparkinson Agents
Cholinergic Agents
Schizophrenia
Schizophrenia, Paranoid
Pathologic Processes

Mental Disorders
Therapeutic Uses
Psychotic Disorders
Schizophrenia and Disorders with Psychotic Features
Disease
Pharmacologic Actions
Muscarinic Antagonists
Autonomic Agents
Dopamine Agents
Peripheral Nervous System Agents
Central Nervous System Agents
Benztropine

ClinicalTrials.gov processed this record on February 08, 2010