Study Warns Psilocybin May Worsen Postpartum Depression, Affect Offspring
September 30, 2025
Recent research from UC Davis reveals that psilocybin, a psychedelic studied for mental health treatment, actually worsens postpartum depression symptoms in mice, increasing anxiety, avoidance behaviors, and depressive-like symptoms in mothers.
This study highlights that hormonal changes during the postpartum period influence how the brain responds to serotonin-affecting drugs like psilocybin, suggesting the need for cautious and tailored approaches when considering psychedelics for postpartum mental health issues.
Pharmacokinetic analysis showed psilocin was transferred to pups through breastmilk, leading to behavioral deficits in offspring, even though no psilocin was detected in the mothers' brains two hours after administration.
Funding for this important research was provided by NIH, the W. M. Keck Foundation, and other UC Davis grants, underscoring the significance of rigorous scientific investigation into psychedelic use during sensitive periods like postpartum.
Given the need for rapid, safe, and accessible treatments for postpartum mood disorders that do not harm developing offspring, psychedelics like psilocybin are being explored as potential antidepressants due to their quick and lasting effects.
This research adds to the understanding of the limitations of psychedelics as therapeutic agents, warning of potential long-term adverse effects, especially in vulnerable populations such as postpartum mothers and their children.
The study emphasizes the importance of understanding both positive and negative effects of psychedelics across different populations, particularly considering the potential long-term impacts on offspring during sensitive developmental periods.
These findings challenge the assumption that psilocybin is universally beneficial for mental health, highlighting the importance of considering hormonal and developmental factors when evaluating psychedelic treatments.
Although clinical trials are exploring psilocybin for postpartum depression, most safety data currently come from male subjects, revealing a significant research gap in understanding its effects on postpartum women.
With limited current treatments for postpartum depression, these findings suggest that safety and efficacy of psychedelics might differ significantly in postpartum populations, warranting cautious investigation.
Peripartum mental illness significantly impacts maternal health, with over 20% of birthing parents experiencing prolonged postpartum mood disorders, emphasizing the urgent need for effective and safe treatments.
Summary based on 8 sources
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Sources

Medical Xpress • Sep 30, 2025
Psilocybin may present unique risks during the postpartum period
News-Medical • Sep 30, 2025
Negative behavioral effects of psilocybin persist in mouse mothers and offspring
GEN - Genetic Engineering and Biotechnology News • Oct 1, 2025
Psilocybin Heightens Postpartum Depression–Like Symptoms in Mice