- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT00825825
Brain Effects of Escitalopram and Citalopram Using fMRI
June 16, 2015 updated by: Michael Henry, MD
A Comparison of the CNS Effects of Equivalent Doses of Escitalopram and Racemic Citalopram Using BOLD fMRI
Escitalopram (Lexapro) and citalopram (Celexa) are similar selective serotonin reuptake inhibitors that alter blood flow to the amygdala and other brain structures involved in regulating mood.
Escitalopram consists of S-citalopram while citalopram contains both S-citalopram and R-citalopram (racemic citalopram).
There is evidence that R-citalopram may block the effects of S-citalopram.
The hypothesis being tested is that because of the antagonist effect of R-citalopram, S-citalopram will have a greater effect on the mood circuit than racemic citalopram when equal doses of S-citalopram are administered.
The study design consists of a two week medication period followed by blood oxygen level dependent (BOLD) functional magnetic resonance imaging (fMRI) while viewing affective visual stimuli.
Study Overview
Status
Completed
Intervention / Treatment
Study Type
Interventional
Enrollment (Actual)
27
Phase
- Phase 4
Contacts and Locations
This section provides the contact details for those conducting the study, and information on where this study is being conducted.
Study Locations
-
-
Massachusetts
-
Boston, Massachusetts, United States, 02135
- Steward St. Elizabeth's Medical Center
-
-
Participation Criteria
Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.
Eligibility Criteria
Ages Eligible for Study
21 years to 50 years (ADULT)
Accepts Healthy Volunteers
Yes
Genders Eligible for Study
Male
Description
Inclusion Criteria:
- Healthy male aged 21 to 50 years.
- Capable of providing informed consent.
- Has an established residence and phone.
Exclusion Criteria:
- Meets DSM-IV criteria for an Axis I or II disorder.
- History of substance dependence or abuse within the past month.
- Use of NSAID's, beta blockers, calcium channel blockers, antidepressants, antipsychotic medications, lithium or other medication which in the opinion of the investigator would alter vascular responsivity.
- Regular use of sedative hypnotic or narcotic medication, or other medication that might affect the individual's perception of visual stimuli.
- History of cataracts or significant visual impairment.
- A medical condition, which in the opinion of the investigator is likely to affect the individual's perception of the visual stimuli or vascular response.
- Participation in a research protocol that included administration of medication within the past 3 months.
- Cigarette smoking.
Study Plan
This section provides details of the study plan, including how the study is designed and what the study is measuring.
How is the study designed?
Design Details
- Primary Purpose: TREATMENT
- Allocation: RANDOMIZED
- Interventional Model: CROSSOVER
- Masking: TRIPLE
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
ACTIVE_COMPARATOR: Escitalopram
One week of escitalopram at 10 mg followed by one week at 20 mg in healthy volunteers.
|
One week of escitalopram taken orally at 10 mg followed by one week at 20 mg daily.
Other Names:
|
ACTIVE_COMPARATOR: Citalopram
One week of citalopram at 20 mg followed by one week at 40 mg in healthy volunteers.
|
One week of citalopram taken orally at 20 mg followed by one week at 40 mg daily.
Other Names:
|
PLACEBO_COMPARATOR: Placebo
Two weeks of placebo in healthy volunteers.
|
Two weeks of placebo taken orally.
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Number of Voxels Showing Greater Activation Following Escitalopram Compared With Citalopram When Happy and Fearful Faces Are Presented in a Rapid Covert Stimulus Presentation.
Time Frame: two weeks
|
Activation was measured using BOLD fMRI in response to happy and fearful faces presented in a rapid covert or masked presentation.
The response following two weeks of escitalopram was compared to the response following two weeks of citalopram.
The cluster of differential activation was located in the left middle temporal gyrus.
|
two weeks
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Number of Voxels Showing Greater Activation Following Escitalopram Compared With Citalopram When Faces and a Fixation Stimulus Are Presented in an Overt Presentation.
Time Frame: 2 weeks
|
Activation was measured using BOLD fMRI in response to affective faces and a fixation stimulus presented in an overt or unmasked presentation.
The response following two weeks of escitalopram was compared to the response following two weeks of citalopram.
The cluster of differential activation was located in the right insular cortex.
|
2 weeks
|
Number of Voxels Showing Greater Activation Following Citalopram Compared With Placebo When Affective Faces Are Presented in a Covert Stimulus Presentation and Contrasted With a Fixation Stimulus.
Time Frame: 2 weeks
|
Activation was measured using BOLD fMRI in response to affective (happy and fearful) faces presented in a covert or masked presentation and contrasted with activation in response to a neutral fixation stimulus.
The response following two weeks of citalopram was compared to the response following two weeks of placebo.
The cluster of differential activation was located in the right occipital fusiform gyrus.
|
2 weeks
|
Number of Voxels Showing Greater Activation Following Citalopram Compared With Placebo When Affective Faces Are Presented in a Covert Stimulus Presentation and Contrasted With a Fixation Stimulus.
Time Frame: 2 weeks
|
Activation was measured using BOLD fMRI in response to affective (happy and fearful) faces presented in a covert or masked presentation and contrasted with activation in response to a neutral fixation stimulus.
The response following two weeks of citalopram was compared to the response following two weeks of placebo.
The cluster of differential activation was located in the right lateral occipital cortex.
|
2 weeks
|
Number of Voxels Showing Greater Activation Following Escitalopram Compared With Placebo When Affective Faces Are Presented in a Covert Stimulus Presentation and Contrasted With a Fixation Stimulus.
Time Frame: 2 weeks
|
Activation was measured using BOLD fMRI in response to affective (happy and fearful) faces presented in a covert or masked presentation and contrasted with activation in response to a neutral fixation stimulus.
The response following two weeks of escitalopram was compared to the response following two weeks of placebo.
The cluster of differential activation was located in the right inferior lateral occipital cortex.
|
2 weeks
|
Number of Voxels Showing Greater Activation Following Placebo Compared With Citalopram When Affective Words Are Contrasted With a Fixation Stimulus.
Time Frame: 2 weeks
|
Activation was measured using BOLD fMRI in response to affective words contrasted with activation in response to a neutral fixation stimulus.
The response following two weeks of placebo was compared to the response following two weeks of citalopram.
The cluster of differential activation was located in the right lingual gyrus and right superior lateral occipital cortex.
|
2 weeks
|
Number of Voxels Showing Greater Activation Following Escitalopram Compared With Citalopram When Affective Words Are Contrasted With a Fixation Stimulus.
Time Frame: 2 weeks
|
Activation was measured using BOLD fMRI in response to affective words contrasted with activation in response to a neutral fixation stimulus.
The response following two weeks of escitalopram was compared to the response following two weeks of citalopram.
The cluster of differential activation was located in the left primary visual cortex.
|
2 weeks
|
Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Sponsor
Collaborators
Investigators
- Principal Investigator: Michael E Henry, MD, Steward St. Elizabeth's Medical Center
Publications and helpful links
The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.
Study record dates
These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.
Study Major Dates
Study Start
May 1, 2007
Primary Completion (ACTUAL)
April 1, 2011
Study Completion (ACTUAL)
April 1, 2011
Study Registration Dates
First Submitted
January 19, 2009
First Submitted That Met QC Criteria
January 20, 2009
First Posted (ESTIMATE)
January 21, 2009
Study Record Updates
Last Update Posted (ESTIMATE)
July 14, 2015
Last Update Submitted That Met QC Criteria
June 16, 2015
Last Verified
June 1, 2015
More Information
Terms related to this study
Additional Relevant MeSH Terms
- Physiological Effects of Drugs
- Neurotransmitter Agents
- Molecular Mechanisms of Pharmacological Action
- Psychotropic Drugs
- Serotonin Uptake Inhibitors
- Neurotransmitter Uptake Inhibitors
- Membrane Transport Modulators
- Serotonin Agents
- Antidepressive Agents
- Antidepressive Agents, Second-Generation
- Citalopram
Other Study ID Numbers
- 00397
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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