GH Research Publishes Phase 2a Trial Results for Postpartum Depression
GH Research announced the publication of the full results from its Phase 2a trial in postpartum depression and the acceptance of two oral presentations at the 37th World Congress of Neuropsychopharmacology. The peer-reviewed article, titled "Inhaled Mebufotenin for Adult Patients with Postpartum Depression: A Phase 2a Open-Label Clinical Trial," has been published in The Journal of Clinical Psychiatry. The article reports the full results from the Phase 2a, single-arm, open-label trial, which enrolled 10 adult women with PPD. Key resultsL Primary endpoint met: Mean Montgomery-Asberg Depression Rating Scale reduction of -35.4 points from baseline to Day 8; 100% of patients achieved remission within two hours of dosing, sustained through Day 8; Improved maternal functioning: Mean 34.1-point increase on the Barkin Index of Maternal Functioning at Day 8; Well-tolerated: No serious adverse events; all treatment-emergent adverse events mild or moderate; no treatment-emergent suicidal ideation or behavior; An analysis of breast milk supports a treatment strategy with only a brief interruption of breastfeeding around GH001 dosing "To our knowledge, this is the first published clinical trial of a psychedelic-based therapeutic specifically in postpartum depression, and the rapid remission achieved by all patients within hours of a single-day inhaled treatment, sustained through Day 8 with a favorable safety profile and only brief interruption of breastfeeding, is encouraging for a population that needs additional rapid-acting therapeutic options. These findings support further investigation of inhaled mebufotenin in larger, randomized, placebo-controlled trials in postpartum depression," said Kristina M. Deligiannidis, MD, of the Feinstein Institutes for Medical Research at Northwell Health.
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- Market Growth Potential: The global Major Depressive Disorder treatment market is projected to grow from approximately $20 billion in 2026 to nearly $36 billion by 2033, reflecting strong long-term demand and attracting billions in investment.
- Clinical Trial Progress: Helus Pharma's HLP003 has surpassed 88% enrollment in the Phase 3 APPROACH study for MDD, with topline data expected in Q4 2026, marking a significant step towards commercialization.
- Significant Efficacy: Phase 2 data for HLP003 demonstrated a ~23-point reduction in MADRS score at 12 months after two 16mg doses, achieving a 100% response rate and 71% remission rate, indicating its potential in treating treatment-resistant depression.
- Strategic Partnerships: Helus Pharma has partnered with TARA Mind to enhance access to mental health treatment for veterans and collaborates with leading mental health organizations to support HLP003 Phase 3 recruitment, further expanding its market impact.
- Enrollment Milestone: Helus Pharma's HLP003 Phase 3 trial has surpassed 86% enrollment, keeping the FDA Breakthrough-designated program on track for a topline data readout in Q4 2026, indicating the company's potential in the mental health treatment space.
- Clinical Trial Significance: Eric So noted that the continued enrollment progress underscores the execution of the clinical program, bringing them closer to the anticipated topline data release, which could provide a transformative treatment option for patients with major depressive disorder, enhancing the company's position in a competitive market.
- FDA Breakthrough Designation: HLP003 has received FDA Breakthrough Therapy Designation, aimed at expediting development and review, signaling significant improvement potential in treating major depressive disorder, thus boosting investor confidence in the program.
- Strong Market Demand: Major depressive disorder affects hundreds of millions globally, with traditional treatments offering limited relief; if HLP003 can validate its efficacy in Phase 3 trials, it could reshape the management of depression.
- Significant Trial Progress: Helus Pharma's HLP003 Phase 3 trial has surpassed 86% enrollment, keeping the FDA Breakthrough Therapy program on track for a topline data readout in Q4 2026, potentially offering a new treatment option for depression.
- Clinical Data Highlights: HLP003 demonstrated substantial efficacy in Phase 2 trials, with a ~23-point reduction in MADRS scores at 12 months, and an 18-week response rate of 75%, improving to 100% at 12 months, laying a solid foundation for the upcoming Phase 3 trial.
- Strong Market Demand: With millions affected by major depressive disorder and existing treatments often inadequate, HLP003's fast-acting, neuroplasticity-oriented approach could reshape depression management, addressing the urgent need for novel therapies in the market.
- Far-reaching Strategic Implications: The Breakthrough Therapy designation accelerates HLP003's development, positioning Helus Pharma to carve out a niche in a competitive landscape, and successful Phase 3 data could pave the way for future commercialization efforts.

- Clinical Trial Results: GH Research PLC's Phase 2a trial results for GH001 indicate a significant average reduction of 35.4 points in depression scores among 10 postpartum depression patients over 8 days, demonstrating the drug's efficacy in alleviating postpartum depression symptoms.
- Rapid Relief Effect: Remarkably, 100% of patients achieved remission (MADRS below 10) within two hours of dosing, showcasing GH001's rapid action mechanism and potentially offering a new solution for postpartum depression treatment.
- Improvement in Maternal Functioning: The study also noted an average increase of 34.1 points in maternal functioning assessments, indicating GH001's positive impact on overall maternal well-being, further supporting its clinical application potential.
- Future Research Plans: GH Research stated that these results support further investigation of inhaled mebufotenin in larger randomized controlled trials, highlighting the company's strategic focus on addressing treatment-resistant depression.
- Financial Performance: GH Research reported a Q1 GAAP EPS of -$0.31, indicating a loss; however, the company maintains a strong cash flow, reflecting ongoing investment in R&D.
- Cash Reserves: As of March 31, 2026, GH Research holds $267.3 million in cash, cash equivalents, and marketable securities, ensuring financial flexibility for future project advancements.
- Capital Raising: The company secured an additional $111.2 million in net cash proceeds from an underwritten offering in April 2026, which will support the advancement of GH001 into Phase 3 clinical trials, enhancing its market competitiveness.
- Market Outlook: With Trump signing legislation to expedite PTSD research, GH Research's prospects in psychedelic treatments, particularly for depression, appear promising, potentially opening new avenues for growth.
- Stock Offering Pricing: GH Research has priced an underwritten offering of 6.53 million ordinary shares at $18 each, aiming for gross proceeds of approximately $117.5 million, which will significantly bolster the company's financial resources for future initiatives.
- Underwriter Participation: The transaction was initiated by Lynx1 Capital Management, with participation from Deep Track Capital and Foresite Capital, while Stifel, Cantor Fitzgerald, and RBC Capital Markets serve as joint book-running managers, reflecting strong market confidence in the company.
- Closing Schedule: The offering is expected to close on April 30, indicating the company's active engagement in capital markets and urgent funding needs, which may influence the advancement of its upcoming projects.
- Market Reaction: Despite a 1% decline in GH Research's shares during premarket trading, the offering is still viewed as a positive step towards enhancing the company's financial position, potentially boosting investor confidence in the long run.






