NCT07621237 · Tonix Pharmaceuticals, Inc.
A Study to Evaluate TNX-102 SL Monotherapy Versus Placebo in Participants With Major Depressive Disorder (MDD)
(HORIZON)
What this study is about
The goal of this clinical trial is to learn if a drug called TNX-102 SL works to treat moderate to severe major depressive disorder in adults. It will also learn about the safety of TNX-102 SL.
View original scientific description
The goal of this clinical trial is to learn if a drug called TNX-102 SL works to treat moderate to severe major depressive disorder in adults. It will also learn about the safety of TNX-102 SL. The main questions it aims to answer are: Does TNX-102 SL improve depression symptoms according to a depression symptom rating scale? What medical problems do participants have when taking TNX-102 SL? Researchers will compare TNX-102 SL to a placebo (a look-alike substance that contains no drug) to see if TNX-102 SL works to treat major depressive disorder.
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
Inclusion criteria
- Primary DSM-5 diagnosis of current MDD.
- The duration of the current MDE must be between 6 weeks and 18 months.
- Without psychotic or catatonic features.
- Capable of reading and understanding English and able to provide written informed consent to participate.
Exclusion criteria
- Diagnosis of DSM-5-defined lifetime bipolar disorder (I, II, or unspecified), schizophrenia, schizoaffective disorder, MDD with psychotic features, other psychotic disorder, or antisocial personality disorder; current (past month) obsessive-compulsive disorder; current (past month) posttraumatic stress disorder; current (past 3 months) anorexia nervosa,
- Diagnosis of borderline personality disorder that is known, suspected
- Participants with comorbid generalized anxiety disorder (GAD), social anxiety disorder (SAD), or panic disorder are excluded only if the GAD, SAD, or panic disorder is considered the primary psychiatric diagnosis, rather than MDD.
- Participants with treatment refractory MDD, ie, previously having failed in their lifetime ≥2 treatments (due to inadequate efficacy) with at least 2 different classes of antidepressants of adequate dose, duration, and treatment adherence.
- History of substance use disorder and/or alcohol use disorder during the preceding 12 months
- Use of antidepressants (including ketamine/esketamine, St. John's Wort, S-adenosyl methionine, and/or trazodone used as an antidepressant) within 4 weeks of Baseline (Visit 2), except for fluoxetine, which must not be within 6 weeks of Baseline (Visit 2)
Where
- Phoenix, Arizona
- Chino, California
- Lemon Grove, California
- Orange, California
- San Diego, California
- Walnut Creek, California
- Jacksonville, Florida
- Maitland, Florida
- Miami, Florida
- Orange City, Florida
- Orlando, Florida
- Tampa, Florida
And 13 more locations — see the full list below.
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced Jun 2, 2026 · Source of record for eligibility and locations