Before a subject can proceed with this study, the study staff will review with them the informed consent form to provide a detailed explanation of this study and its potential risks and benefits. After this explanation, the study staff will answer any questions. Then, if the potential participant wishes to proceed, they will sign the informed consent form to confirm that they understand and are willing to participate in the study. Study participation is completely voluntary at all times.
After consent has been given, the screening period of the study will begin. During screening, the study staff will review medical history and previous antidepressants, and conduct a series of study-related examinations, questionnaires, and laboratory tests to see if the study requirements are met. The screening period will last up to 28 days.
Participants who satisfy the study requirements and wish to proceed with the study will be assigned to take either CLE-100 or a placebo, once daily, for 4 weeks. In this study, whichever is assigned, CLE-100 or placebo, will be called the "study drug." Neither the study participant nor study staff will know which study drug has been assigned. This is why this Treatment Period is called the Double-Blind Period.
Participants will take the study drug at home on most days, at bedtime. When taken at home at bedtime, participants will not be allowed to drive within 8 hours of taking the study drug. Sometimes the assigned study drug will be taken at the study clinic and a car service will take participants to and from the study clinic.
Participants who complete the Double-Blind treatment period will be offered the option of receiving active study drug (CLE-100) for a six month period at no cost, as long as they continue to meet the study eligibility requirements.
If you, or someone you know, is in crisis or needs immediate assistance, please call 911 immediately. To talk to someone now, please call the National Suicide Prevention Lifeline at 1-800-273-8255.
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