Anxiety & Depression Association of America

Search Clinical Trials

Before medications are approved by the U.S. Food and Drug Administration (FDA) or before certain therapy methods are widely accepted as effective, they are tested on people who volunteer to participate in a clinical trial.

Organizations across the country are looking for people like you to take part in their research studies. The list of studies below have been selected from ClinicalTrials.gov based on their inclusion of one or more of the following terms: anxiety disorders, depression, OCD, PTSD, and bipolar disorder.

The Anxiety and Depression Association of America (ADAA) is supportive of research that is conducted through clinical trials. Participating in research can potentially help change the mental health outcomes for you and others who suffer anxiety, depression, and related disorders. You may learn about new interventions/treatments that are being considered.

Read this ADAA blog about things to know and questions to ask before committing to a clinical trial.

This website page is brought to you in partnership with ResearchMatch.

Condition

Gender

Age

Accepts Healthy Volunteers

876 matching studies

Sponsor Condition of Interest
Neurobiology of Suicide National Institute of Mental Health (NIMH) Healthy Volunteers Depression Background: There are no good treatments for people considering suicide. Researchers want to study suicide with questions, blood tests, brain imaging, and sleep studies. They hope to better understand suicide, so they can help suicidal people. Objective: To understand what happens in the brain w1 expand Background: There are no good treatments for people considering suicide. Researchers want to study suicide with questions, blood tests, brain imaging, and sleep studies. They hope to better understand suicide, so they can help suicidal people. Objective: To understand what happens in the brain when someone has thought about or attempted suicide. Eligibility: Group 1: Adults ages 18 70 who have thought about or attempted suicide recently Group 2: Adults ages 18 70 who have thought about or attempted suicide in the past Group 3: Adults ages 18 70 who have depression or anxiety, but have never thought about suicide Group 4: Healthy volunteers the same ages. Design: Participants will be screened in another protocol. Adults who have recently thought about or attempted suicide must be referred by a doctor. They may do up to 3 phases of this study. Groups 2, 3 and 4 will do only Phase 1 and will not get ketamine. Phase 1: 1 week in hospital. Participants will have: Physical exam. Questions about thoughts and feelings. Thinking and memory tests and simple tasks. Blood and urine tests. Two MRI scans. Participants will lie on a table that slides into a metal cylinder that takes pictures. They will have a coil over their head and earplugs and do a computer task. Sleep test. Disks and bands will be placed on the body to monitor it during sleep. Magnetic detectors on their head while they perform tasks. A wrist monitor for activity and sleep. Lumbar puncture (optional). A needle will collect fluid from the back. Shock experiments (optional). Participants will observe pictures and sounds and feel a small shock on the hand. Phase 2: 4 days in hospital. A thin plastic tube will be placed in each arm, one for blood draws, the other to get the drug ketamine once. Participants will repeat most of the Phase 1 tests. Phase 3: up to 4 more ketamine doses over 2 weeks. Participants will have follow-up calls or visits at 6 months and then maybe yearly for 5 years. Type: Interventional Start Date: Dec 2015 open study
Strengthening Health and Insight in New Educators University of Alabama, Tuscaloosa Anxiety Symptoms Depressive Symptoms Teachers are at notable risk for depression and anxiety. The present study tests an app-based mindfulness intervention for teachers in their final year of training with the goal of preventing the deterioration of their mental health during the transition into the classroom. The project will strengt1 expand Teachers are at notable risk for depression and anxiety. The present study tests an app-based mindfulness intervention for teachers in their final year of training with the goal of preventing the deterioration of their mental health during the transition into the classroom. The project will strengthen the research environment at the University of Alabama and will involve undergraduate research assistants in each step of the research process. Type: Interventional Start Date: Jan 2025 open study
Dose-Optimized and Spaced Transcranial Direct Current Stimulation for Treatment-Resistant Depression University of California, San Diego Treatment Resistant Depression Major Depressive Disorder This study aims to evaluate the feasibility, safety, and tolerability of an innovative approach to treating Major Depressive Disorder (MDD), particularly in cases where patients have not responded well to traditional therapies. Specifically, the objective is to evaluate the antidepressant effects o1 expand This study aims to evaluate the feasibility, safety, and tolerability of an innovative approach to treating Major Depressive Disorder (MDD), particularly in cases where patients have not responded well to traditional therapies. Specifically, the objective is to evaluate the antidepressant effects of a Dose-Optimized and Spaced Transcranial Direct Current Stimulation (DOS-tDCS) protocol in participants with treatment-resistant depression (TRD) compared to spaced tDCS only and sham tDCS in a 3-arm randomized controlled trial (RCT). The proposed method involves applying low-intensity electrical currents through the scalp in a manner that is both more intense and more frequently spaced than standard treatments. This approach is hypothesized to lead to a significant reduction in depressive symptoms. Participants in the study will be randomly assigned to one of three groups: the experimental group receiving the DOS-tDCS treatment, a group receiving spaced tDCS only, or a control group receiving a sham (placebo) treatment. Outcomes will be measured over a period of six weeks. The study's goal is to offer a potentially more accessible and effective treatment option for individuals who have not benefited from existing MDD therapies. Type: Interventional Start Date: Sep 2024 open study
Phase 3 Study of Adjunctive Treatment With Seltorexant in Adult and Elderly Participants With Major1 Janssen Research & Development, LLC Depressive Disorder, Major The purpose of this study is to know how well seltorexant works, and also to evaluate safety and maintenance effect of seltorexant compared with placebo as an adjunctive therapy to an antidepressant in improving depressive symptoms in participants with major depressive disorder with insomnia sympto1 expand The purpose of this study is to know how well seltorexant works, and also to evaluate safety and maintenance effect of seltorexant compared with placebo as an adjunctive therapy to an antidepressant in improving depressive symptoms in participants with major depressive disorder with insomnia symptoms (MDDIS) who have had an inadequate response to current antidepressant therapy with a selective serotonin reuptake inhibitor (SSRI) or serotonin-norepinephrine reuptake inhibitor (SNRI). Type: Interventional Start Date: Jul 2024 open study
A Study to Test Different Doses of BI 1569912 in People With Depression Boehringer Ingelheim Depressive Disorder, Major This study is open to adults between 18 and 65 years of age with a type of depression called major depressive disorder. The purpose of the study is to find out whether a medicine called BI 1569912 helps people with depression. Participants are put into 4 groups randomly, which means by chance. Thr1 expand This study is open to adults between 18 and 65 years of age with a type of depression called major depressive disorder. The purpose of the study is to find out whether a medicine called BI 1569912 helps people with depression. Participants are put into 4 groups randomly, which means by chance. Three of the 4 groups take different doses of BI 1569912 and 1 group takes placebo. Placebo tablets looks like BI 1569912 but do not contain any medicine. Participants take the tablets once a day for 6 weeks. Participants are in the study for about 2.5 months. During this time, they visit the study site at least 7 times. At the visits, doctors and their staff ask participants about their depression symptoms. At the end of the study, the results are compared between the groups to see whether the treatment works. The doctors also regularly check the general health of participants and take note of any unwanted effects. Type: Interventional Start Date: Oct 2024 open study
Feasibility Testing a Meditation App for Professionals Working With Youth in the Legal System University of Illinois at Chicago Anxiety Depression Burnout, Professional Emotion Regulation This feasibility clinical trial aims to assess the feasibility of implementing a 1-month app-based meditation program with officers in the juvenile legal system and other professionals working directly with legal-involved youth. expand This feasibility clinical trial aims to assess the feasibility of implementing a 1-month app-based meditation program with officers in the juvenile legal system and other professionals working directly with legal-involved youth. Type: Interventional Start Date: Nov 2024 open study
To Evaluate the Effects of NMRA-335140 on Symptoms of Major Depression in Participants With Bipolar1 Neumora Therapeutics, Inc. Major Depressive Episode Associated With Bipolar II Disorder This is a randomized, double-blind, placebo-controlled pilot study aiming to evaluate the effects of NMRA-335140 on symptoms of major depression in adults with Bipolar (BP) II disorder. The study design consists of a Screening Period (up to 28 days), a 6-week Treatment Period (during which particip1 expand This is a randomized, double-blind, placebo-controlled pilot study aiming to evaluate the effects of NMRA-335140 on symptoms of major depression in adults with Bipolar (BP) II disorder. The study design consists of a Screening Period (up to 28 days), a 6-week Treatment Period (during which participants will receive either NMRA-335140 or placebo), and a 6-week Safety Follow-up Period. Type: Interventional Start Date: May 2024 open study
Propofol-Enhanced Assessment of Ketamine for Chronic Pain and Depression Stanford University Chronic Pain Depression The goal of this clinical trial is to compare ketamine to a placebo when given as a single infusion during IV sedation in adults with chronic pain and depression. We do not know whether ketamine will be more effective than placebo under these circumstances. This study aims to: - Evaluate wheth1 expand The goal of this clinical trial is to compare ketamine to a placebo when given as a single infusion during IV sedation in adults with chronic pain and depression. We do not know whether ketamine will be more effective than placebo under these circumstances. This study aims to: - Evaluate whether ketamine is more effective than a placebo in treating chronic pain and depression - Confirm that propofol sedation is a safe way to keep participants blinded to treatment - Assess patients' comfort with the sedation process to improve future studies - Explore whether patient expectations affects their pain and depression Participants will: - Need to qualify for the study based on stringent medical criteria - Undergo sedation with propofol - Randomly receive either a ketamine or a placebo (saline) infusion during sedation - Complete several study assessments over 5-7 weeks Type: Interventional Start Date: Nov 2024 open study
Evaluating Signs of Safety: A Deaf-Accessible Therapy Toolkit for AUD and Trauma University of Massachusetts, Worcester PTSD Alcohol; Use, Problem The U.S. Deaf community - a group of more than one million Americans who communicate using American Sign Language (ASL) - experiences nearly triple the rate of lifetime problem drinking and twice the rate of trauma exposure compared to the general population. Although there are several treatments f1 expand The U.S. Deaf community - a group of more than one million Americans who communicate using American Sign Language (ASL) - experiences nearly triple the rate of lifetime problem drinking and twice the rate of trauma exposure compared to the general population. Although there are several treatments for alcohol use disorder (AUD) and posttraumatic stress disorder (PTSD) in hearing populations, none have been developed for or tested with Deaf clients. To address these barriers, the study team developed Signs of Safety, a Deaf-accessible therapy toolkit for treating AUD and PTSD. Their aims are to conduct a nationwide, virtual clinical trial to compare (1) Signs of Safety with (2) treatment as usual and (3) a no treatment control, to collect data on clinical outcomes, and to explore potential mediators and moderators of outcome. Type: Interventional Start Date: Dec 2024 open study
Cannabis for Palliative Care in Cancer University of Colorado, Boulder Sleep Anxiety Depression Pain Many cancer patients suffer from pain, sleep, and mood problems and are using cannabis to relieve these symptoms. Cannabis may provide such relief but may also produce negative side effects including cognitive impairment, an especially problematic issue for cancer patients, indicating more research1 expand Many cancer patients suffer from pain, sleep, and mood problems and are using cannabis to relieve these symptoms. Cannabis may provide such relief but may also produce negative side effects including cognitive impairment, an especially problematic issue for cancer patients, indicating more research on cannabis use in the cancer context is required. In this endeavor, the present study seeks to compare the use of hemp-derived CBD (Cannabidiol) with and without THC (Delta-9-tetrahydrocannabinol) versus placebo on measures of sleep, pain, mood, subjective and objective cognitive functioning, and quality of life within 185 cancer patients. Type: Interventional Start Date: Jul 2024 open study
Targeted Plasticity Therapy for PTSD The University of Texas at Dallas PTSD, Post Traumatic Stress Disorder Objectives of this study are to provide continued safety assessment for the ReStore system, and to gain further estimates of the effect size of Vagus Nerve Stimulation (VNS) therapy with Prolonged Exposure Therapy (PE) compared to PE with placebo (sham) stimulation in participants with posttraumati1 expand Objectives of this study are to provide continued safety assessment for the ReStore system, and to gain further estimates of the effect size of Vagus Nerve Stimulation (VNS) therapy with Prolonged Exposure Therapy (PE) compared to PE with placebo (sham) stimulation in participants with posttraumatic stress disorder (PTSD) Type: Interventional Start Date: Dec 2024 open study
Cognitive Dysfunction and Inflammation in Depression: Experimental Inhibition Via Infliximab Massachusetts General Hospital Depressive Disorder, Major Inflammation This study is a mechanistic randomized controlled trial that investigates whether inhibition of tumor necrosis factor signaling via intravenous infusion of infliximab improves psychomotor speed and executive functioning in depressed individuals who exhibit an inflammatory phenotype. expand This study is a mechanistic randomized controlled trial that investigates whether inhibition of tumor necrosis factor signaling via intravenous infusion of infliximab improves psychomotor speed and executive functioning in depressed individuals who exhibit an inflammatory phenotype. Type: Interventional Start Date: Dec 2024 open study
Can Rumination-Focused Cognitive Behavioral Therapy Reduce the Risk of Cardio-vascular Disease? University of Louisville Rumination Depressive Symptoms Blood Pressure Many people know that a poor diet, exercise, smoking, and alcohol use cause heart disease. However, a less known factor that increases the risk of heart disease is depression. In addition, heart disease can also make depression worse. Almost half of American adults have some form of heart disease.1 expand Many people know that a poor diet, exercise, smoking, and alcohol use cause heart disease. However, a less known factor that increases the risk of heart disease is depression. In addition, heart disease can also make depression worse. Almost half of American adults have some form of heart disease. Patients with low income are at an even greater risk. The circular relation between depression and heart disease raises the question of whether or not there are factors that lead to both. Attacking a factor that affects both depression and heart disease could help prevent them both. One such factor is rumination which is when someone tends to have repeated negative thoughts that loop without end. This loop in turn tears and wears down the body over time, making the person be at risk for heart disease and depression. Rumination-Focused Cognitive Behavioral Therapy (RFCBT) is a tool that targets rumination and, by doing so, reduces the risk for depression. While research has shown RFCBT helps to reduce or stop the loop that leads to depression, this project will further look at the effect of RFCBT on measures of heart health persons with low income. Type: Interventional Start Date: Aug 2023 open study
Anterior Cruciate Ligament Recovery With Virtual Psychological Intervention Henry Ford Health System Depression Anterior Cruciate Ligament Injuries Mental Health Issue The goal of this parallel arm prospective randomized control trial study is to compare outcomes in Anterior Cruciate Ligament Reconstruction (ACLR) Surgery patients after exposure to a virtual psychological intervention (VPI) versus standard care. The main question the investigators are asking is i1 expand The goal of this parallel arm prospective randomized control trial study is to compare outcomes in Anterior Cruciate Ligament Reconstruction (ACLR) Surgery patients after exposure to a virtual psychological intervention (VPI) versus standard care. The main question the investigators are asking is if virtual administration of psychological CBT modules will be an accessible and convenient vehicle to improve ACLR outcomes. Participants will be placed either into a treatment group receiving virtual modules of cognitive behavioral therapy in addition to standard of care ACLR surgery or the control group receiving only the standard of care ACLR surgery. The investigators hypothesize that ACLR patients in the VPI cohort will have improved return to sport and post operative outcomes compared to controls. Type: Interventional Start Date: Sep 2023 open study
Exercise to Augment TMS in Those With Treatment Resistant Depression Butler Hospital Treatment Resistant Depression Given the growing evidence that aerobic increases cortical excitability and promotes neuroplasticity, the scientific premise for its potential priming effect on the brain is strong. Combining AE with rTMS may produce a neural environment optimized for a robust physiological effect of rTMS, thereby1 expand Given the growing evidence that aerobic increases cortical excitability and promotes neuroplasticity, the scientific premise for its potential priming effect on the brain is strong. Combining AE with rTMS may produce a neural environment optimized for a robust physiological effect of rTMS, thereby leading to improved depression outcomes. With positive findings, this study would provide preliminary support for an innovative, safe and feasible approach for improving outcomes for this significant public health problem. Type: Interventional Start Date: Feb 2024 open study
Paired tVNS With ERP in OCD University of Florida OCD In the proposed investigation, the investigator will develop pilot data for the use of tVNS (transcutaneous vagal nerve stimulation) to enhance efficacy of exposure and response prevention therapy (ERP) to improve treatment success in patients with OCD. This data will include tolerability informati1 expand In the proposed investigation, the investigator will develop pilot data for the use of tVNS (transcutaneous vagal nerve stimulation) to enhance efficacy of exposure and response prevention therapy (ERP) to improve treatment success in patients with OCD. This data will include tolerability information from therapists and patients with OCD, effect sizes on real world clinical outcomes for the combinatory treatment, and mechanistic data on brain changes associated with treatment. Type: Interventional Start Date: Jun 2022 open study
Treatment Research Investigating Depression Effects on Neuroimmune Targets (TRIDENT) Florida International University Depression HIV-1-infection Inflammation The purpose of this randomized controlled trial is to understand how a cognitive-behavioral treatment (a form of psychological treatment) for depression changes the gut microbiome (micro-organisms that regulate the health of the gut), immune system, and the brain functioning in people living with H1 expand The purpose of this randomized controlled trial is to understand how a cognitive-behavioral treatment (a form of psychological treatment) for depression changes the gut microbiome (micro-organisms that regulate the health of the gut), immune system, and the brain functioning in people living with HIV. Type: Interventional Start Date: Aug 2022 open study
Rapid Acting TMS for Suicide Ideation in Depression Stanford University Depressive Disorder, Major Suicide This study evaluates the effects of an accelerated schedule of theta-burst stimulation, termed accelerated intermittent theta-burst stimulation (aiTBS), on the neural networks underlying explicit and implicit suicidal cognition in inpatients with major depressive disorder. expand This study evaluates the effects of an accelerated schedule of theta-burst stimulation, termed accelerated intermittent theta-burst stimulation (aiTBS), on the neural networks underlying explicit and implicit suicidal cognition in inpatients with major depressive disorder. Type: Interventional Start Date: Nov 2021 open study
Efficacy Trial of the CALM Intervention UConn Health Anxiety Disorder of Childhood Excessive anxiety among elementary students is highly prevalent and associated with impairment in academic, social, and behavioral functioning. The primary aim of this project is to evaluate the initial efficacy of a brief nurse-delivered intervention (CALM: Child Anxiety Learning Modules), relativ1 expand Excessive anxiety among elementary students is highly prevalent and associated with impairment in academic, social, and behavioral functioning. The primary aim of this project is to evaluate the initial efficacy of a brief nurse-delivered intervention (CALM: Child Anxiety Learning Modules), relative to a credible comparison (CALM-R, relaxation skills only) and a waitlist control for reducing anxiety symptoms and improving education outcomes at post intervention and at a 1-year follow-up. In addition, the research team will assess the cost effectiveness of CALM versus CALM-R and the waitlist control and examine potential predictors, moderators, and mediators of CALM's impact on child outcomes based on the proposed theory of change. Type: Interventional Start Date: Dec 2020 open study
Psilocybin Treatment of Major Depressive Disorder With Co-occurring Alcohol Use Disorder Johns Hopkins University Major Depressive Disorder Alcohol Use Disorder The purpose of this study is to determine whether psilocybin, a hallucinogenic drug, is effective in reducing depressive symptoms and amount of drinking in patients with co-occurring Major Depressive Disorder (MDD) and Alcohol Use Disorder (AUD). expand The purpose of this study is to determine whether psilocybin, a hallucinogenic drug, is effective in reducing depressive symptoms and amount of drinking in patients with co-occurring Major Depressive Disorder (MDD) and Alcohol Use Disorder (AUD). Type: Interventional Start Date: Apr 2021 open study
Social Support and Reduced Fear Acquisition University of California, Los Angeles Fear Anxiety University of California, Los Angeles researchers will recruit healthy participants and anxious participants (those diagnosed with social anxiety disorder) age 18-55 years old to participate in a study examining whether the ability of social support figure reminders to prevent the acquisition of fe1 expand University of California, Los Angeles researchers will recruit healthy participants and anxious participants (those diagnosed with social anxiety disorder) age 18-55 years old to participate in a study examining whether the ability of social support figure reminders to prevent the acquisition of fear in healthy participants extends to those with anxiety disorders. After being recruited from the UCLA community (healthy participants, n = 50) or referred by treatment providers at the Anxiety and Depression Research Center at UCLA (anxious participants, n =50) and undergoing a telephone screening and in-person screening, 100 participants will be enrolled in the study. During the experiment, all participants will undergo the same procedures: undergoing fear acquisition procedures--the repeated pairing of a neutral image with a mild electric shock that ultimately leads to the association of threat of shock with the image--in the presence of an image of a social support figure (provided by participants) and an image of a smiling stranger. Type: Interventional Start Date: Feb 2022 open study
Pain and Major Depressive Disorder University of California, Los Angeles Major Depressive Disorder Chronic Pain This study will examine the effects of brain stimulation on pain symptoms associated with Major depressive disorder. This study will enroll 54 Subjects. Study subjects will be asked to complete surveys about their mood and well-being, 2 blood draws, 2 MRIs, 3 electroencephalograms, and receive 30 t1 expand This study will examine the effects of brain stimulation on pain symptoms associated with Major depressive disorder. This study will enroll 54 Subjects. Study subjects will be asked to complete surveys about their mood and well-being, 2 blood draws, 2 MRIs, 3 electroencephalograms, and receive 30 treatments of blinded transcranial magnetic stimulation. There is no control group as all subjects will receive some form of active treatment. Subjects are required to participate in 30-33 study visits and volunteer 40 hours of their time. Compensation for this study is $150 for completing all study activities. Type: Interventional Start Date: Mar 2023 open study
Improving Preschool Outcomes by Addressing Maternal Depression in Head Start Brown University Maternal Depression Within a research network of Head Start centers in Massachusetts, an efficacy trial of a stepped-care intervention (SCI) to address maternal depression, using intervention components that both prevent depression and help those in major depressive episode (MDE) engage with care, will be conducted. B1 expand Within a research network of Head Start centers in Massachusetts, an efficacy trial of a stepped-care intervention (SCI) to address maternal depression, using intervention components that both prevent depression and help those in major depressive episode (MDE) engage with care, will be conducted. Both the prevention and engagement components of the model have strong, supportive randomized trial evidence for both their efficacy and safety; but they have yet to be synthesized and tested within a coordinated intervention, applicable to a broad population base. Stepped-care interventions are commonly used in mental health service projects, in which the intensity or type of service is calibrated to the severity of illness. Type: Interventional Start Date: Aug 2023 open study
Magnetic Seizure Therapy in Bipolar Depression (MST-BpD) and Treatment Resistant Depression (MST-TR1 Edison Leung Bipolar Disorder The purpose of this study is to compare the efficacy and side effects magnetic seizure therapy (MST) and electroconvulsive therapy (ECT) in Bipolar Depression (MST-BpD) and Treatment Resistant Depression (MST-TRD). expand The purpose of this study is to compare the efficacy and side effects magnetic seizure therapy (MST) and electroconvulsive therapy (ECT) in Bipolar Depression (MST-BpD) and Treatment Resistant Depression (MST-TRD). Type: Interventional Start Date: Mar 2025 open study
Neuropharmacologic Imaging and Biomarker Assessments of Response to Acute and Repeated-Dosed Ketami1 National Institute of Mental Health (NIMH) Healthy Volunteer Major Depressive Disorder Depression Background: Most medications that treat depression take weeks or months to work. Researchers want to develop fast-acting treatments. One dose of ketamine has a rapid antidepressant effect. For most people, this lasts a week or less. Repeated doses of ketamine may help maintain this effect. Object1 expand Background: Most medications that treat depression take weeks or months to work. Researchers want to develop fast-acting treatments. One dose of ketamine has a rapid antidepressant effect. For most people, this lasts a week or less. Repeated doses of ketamine may help maintain this effect. Objective: Main Study: To study the effects of ketamine in treating depression. Ketamine Metabolites Substudy: To study how ketamine effects brain chemistry. To study how ketamine effects the brain. This is done by looking at metabolites, which are created when a drug is broken down. Eligibility: Main Study: People ages 18-65 with major depressive disorder and healthy volunteers Ketamine Metabolites Substudy: Healthy volunteers ages 18-65 Design: Main Study: Participants will be screened in another study, with: - Medical and psychiatric history - Psychiatric and physical exam - Blood, urine, and heart tests Participants will be inpatients at NIH for 4 phases totaling 14-20 weeks. Phase I (2-7 weeks): - Gradually stop current medications - MRI: Participants lie and perform tasks in a machine that takes pictures of the body. - Mood and thinking tests - Blood and urine tests - Sleep test: Monitors on the skin record brain waves, breathing, heart rate, and movement during sleep. - Transcranial magnetic stimulation: A coil on the scalp gives an electrical current that affects brain activity. - Stress tests: Electrodes on the skin measure reactions to loud noises or electric shocks. Phase I tests are repeated in Phases II and III and in the final visit. Phase II (4-5 weeks): - 4 weekly IV infusions of ketamine or a placebo during an MRI or MEG. For the MEG, a cone over the head records brain activity. Phase III (optional): - 8 infusions of ketamine over 4 weeks Phase IV (optional): - Symptoms monitoring for 4 weeks - Participants will have a final visit. They will be offered standard treatment at NIH for up to 2 months. Ketamine Metabolites Substudy: Participants will be screened in another study, with: - Medical and psychiatric history - Psychiatric and physical exam - Blood, urine, and heart tests Participants will be inpatients at NIH for 4 days. Study Procedures: Mood and thinking tests Blood and urine tests 1 infusion of ketamine Spinal tap and spinal catheter: Used to get samples of cerebrospinal fluid (CSF). This is a fluid that moves around and within the brain and spinal cord. Studying CSF will help us learn how ketamine effects brain chemistry Type: Interventional Start Date: May 2017 open study