Low Field Magnetic Stimulation (LFMS) in Subjects With Treatment-Resistant Depression (TRD)

The primary objective of this study:

- To compare the relative efficacy, as measured by a change in the 6-item Hamilton Rating
Scale for Depression (HAM-D6), of 20 and 60 minutes of LFMS compared to sham (placebo)
in subjects with treatment resistant depression (TRD).

Secondary objectives:

- To determine if subjects with TRD may respond to 120 minutes of LFMS.

- To determine the persistence of response to LFMS therapy during the observation period.

- To evaluate the safety and tolerability of LFMS.

Inclusion Criteria: (Key)

- Meets the Diagnostic and Statistical Manual of Mental Disorder, 5th Edition (DSM-5)
criteria for Major Depressive Disorder (MDD), as determined by psychiatric evaluation.

- Has TRD of the current MDE, as assessed at the site by the Massachusetts General
Hospital/Antidepressant Treatment Response Questionnaire (MGH/ATRQ).

- On an adequate dose of one antidepressant therapy (ADT) for at least eight weeks prior
to the screening visit (Visit 1). The ADT dose must be stable for at least four weeks
prior to the screening visit (Visit 1). Subjects must be willing to remain on the same
stable dose of ADT upon signing the informed consent form until the end of the
treatment observation period (end of Week 2) and, where possible, to the end of study
participation

Exclusion Criteria: (Key)

- Have failed four or more lifetime adequate ADT treatment regimens (including the
ongoing ADT for the current MDE).

- Have been treated with adjunctive antipsychotic medication with an antidepressant for
at least two weeks during the current depressive episode.

- Are deemed to be at significant risk for suicidal behavior

- Are unable to lie on their back for the duration of study treatment

- Have a lifetime history of:

1. Delirium, dementia, amnestic, or other cognitive disorder;

2. Schizophrenia or any psychotic disorder, based on the Structured Clinical
Interview for DSM-5 Axis I Disorders Patient Edition (SCID-I/P);

3. Bipolar I or II disorder, based on the SCID-I/P.

- Have a current DSM-5 diagnosis at the screening visit (Visit 1) of:

1. An eating disorder active within the 12 months prior to the screening visit
(Visit 1);

2. Comorbid anxiety disorders that predominate over MDD, as assessed by the
investigator;

3. Alcohol or substance use disorder active within the 12 months prior to the
screening visit (Visit 1);

4. Clinically significant DSM-5 Axis II disorder.

- Have ever received electroconvulsive therapy, vagal nerve stimulation, deep brain
stimulation or repetitive transcranial magnetic stimulation.

- Have a non-removable programmable device or appliance such as cardiac pacemakers or
cochlear implants.

- Have any non-removable ferromagnetic implants, or conductive or other magnetic
sensitive materials present in the head or neck .

- Have a lifetime history of seizures or clinically significant electroencephalography
abnormalities. A history of childhood febrile seizures is permitted.