Randomized Trial of Adult Participants With Generalized Anxiety Disorder

Inclusion Criteria:

• Primary diagnosis of generalized anxiety disorder (GAD) either moderate or severe asper Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-V) asconfirmed by the MINI at Screening, in addition to a psychiatric evaluation by aboard- certified or Biohaven-approved board-eligible psychiatrist; The duration ofillness must be ≥ 1 year
• Hamilton Anxiety Rating Scale (HAM-A) Total Score of ≥ 18 at both Screening andBaseline
• Clinical Global Impression of Severity Scale (CGI-S) score of ≥ 4 at both Screeningand Baseline
• Determined by the investigator to be medically stable at baseline/randomization asassessed by medical history, physical examination, laboratory test results, andelectrocardiogram testing. Participants must be physically able and expected tocomplete the trial as designed
• Minimum of 6 years of education or equivalent to complete necessary scales andunderstand consent forms
• Participants must be able to understand and agree to comply with the prescribed dosageregimens and procedures; report for regularly scheduled office visits; and reliablycommunicate with study personnel about adverse events and concomitant medications
• Women of childbearing potential must have a negative serum pregnancy test at screeningand a negative urine pregnancy test prior to dosing at Baseline

Exclusion Criteria:

• Participants with a primary DSM-V psychiatric disorder diagnosis other than GAD withinthe past 6-months. Note: Participants with a secondary diagnosis of comorbid socialanxiety disorder or specific phobia are allowed, if in the investigator's judgement,the diagnosis is not sufficiently prominent and active so as to be confound theassessment of GAD symptoms
• Participants should be excluded at screening or baseline if any medical or psychiatriccondition other than GAD, as specified in the inclusion criteria, could predominantlyexplain or contribute significantly to the subjects' symptoms or that could confoundassessment of GAD symptoms
• Participants who report a history of inadequate response (per investigator judgement)to 3 or more adequate trials (including current trial) of any SSRI or SNRI, at anadequate dose and adequate duration (at least 8 weeks) for the treatment of GAD withinthe 3 years prior to randomization
• Hamilton Depression Rating Scale 17 (HAM-D-17) item 1 of >1 at Screening or Baseline
• HAM-D-17 of > 19 at Baseline
• Any eating disorder within the last 12 months prior to Screening
• Acute suicidality in the last 12 months, or suicide attempt or self-injurious behaviorin the last 12 months prior to Screening
• Score of >0 on the Sheehan Suicidality Tracking Scale for the period of 12 monthsprior to screening, and at baseline
• History of psychosurgery, deep brain stimulation (DBS) or electroconvulsive therapy (ECT)