Phase 2
Completed N=319
A Study of the Safety and Efficacy of SP-624 in the Treatment of Adults With Major Depressive Disorder
Source: ClinicalTrials.gov NCT04479852 ↗Enrolled (actual)
319
Serious AEs
0.6%
Results posted
Jun 2025
Primary outcomePrimary: Change From Baseline to Week 4 in Montgomery Asberg Depression Rating Scale (MADRS) Total Score — -12.6; -10.8 Score on a scale — p=0.133
Summary
This is a Phase 2 clinical study evaluating the safety and effectiveness of SP-624 as compared to placebo in the treatment of adults with Major Depressive Disorder.
Outcome Measures
| Outcome | Result | p-value |
|---|---|---|
| PRIMARY Change From Baseline to Week 4 in Montgomery Asberg Depression Rating Scale (MADRS) Total Score |
-12.6; -10.8 | 0.133 |
| SECONDARY Change From Baseline to Week 4 in Clinical Global Impression - Severity (CGI-S) Total Score |
-1.2; -0.9 | 0.059 |
| SECONDARY Change From Baseline to Week 4 in the 17-item Hamilton Depression Rating Scale (HAM D-17) Total Score |
-8.3; -7.1 | 0.159 |
| SECONDARY Change From Baseline to Week 4 in the Sheehan Disability Scale (SDS) |
-5.6; -4.6 | 0.188 |
| SECONDARY Change From Baseline to Week 4 in the Quick Inventory of Depressive Symptomology - Self Report (QIDS-SR) |
-5.0; -4.1 | 0.091 |
| SECONDARY Change From Baseline to Week 4 in the Quality of Life Enjoyment and Satisfaction Questionnaire - Short Form (Q-LES-Q-SF) |
9.5; 7.8 | 0.243 |
Eligibility Criteria
Inclusion Criteria
- Willing and able to provide written informed consent to participate in the study
- Males and females, aged 18 to 65 years
- In generally good physical health
- Body mass index (BMI) must be between 18 and 40 kg/m2
- Females of reproductive potential and males with partners of reproductive potential must agree to remain abstinent or use adequate and reliable contraception throughout the study and for at least 30 days after the last dose of study drug
- Subjects must meet criteria for moderate to severe Major Depressive Disorder, as confirmed by the Mini International Neuropsychiatric Interview (MINI)
- Willing and able to comply with the study design schedule and other requirements
Exclusion Criteria
- Female who is pregnant, breastfeeding, or less than six months postpartum at Screening
- History or presence of any clinically significant medical condition, disease, or surgical history that could jeopardize the safety of the subject or validity of the study data, or interfere with the absorption, distribution, metabolism, or excretion of the study drug
- Failure to discontinue all psychoactive medications or psychoactive supplements including antidepressants and mood stabilizers, within a time period prior to Baseline corresponding to at least five half-lives of the medication in question
- Presence of a clinically significant abnormality on physical examination or electrocardiogram (ECG), including a corrected QT interval using Fridericia's formula (QTcF) >450 msec for males and >470 msec for females
- Presence of uncontrolled hypertension, defined as consistent systolic blood pressure (SBP) >160 mmHg or consistent diastolic blood pressure (DBP) >95 mmHg despite present therapy
- Screening laboratory value(s) outside the laboratory reference range that are considered to be clinically significant by the Investigator (clinical chemistry, hematology, coagulation, and urinalysis)
- Screening liver function tests (ALT, AST, Alkaline phosphatase) > 2x the upper limit of normal
- Subjects who, in the opinion of the Investigator, are not suitable candidates for the study
Data sourced from ClinicalTrials.gov (NCT04479852). Outcome figures and adverse-event rates are extracted automatically from the registry's posted results and are provided for clinician reference, not as a substitute for the primary publication. Informational only — not medical advice.