In 2021, Imperial College London ran the first head-to-head trial comparing psilocybin to escitalopram (Lexapro). Here's what they found — and what it means.
The Short Answer: In a randomized head-to-head trial for adults with major depressive disorder, psilocybin-assisted therapy outperformed an SSRI (escitalopram) in reducing depressive symptoms over about six weeks, with faster onset and greater overall improvement. More participants achieved response or remission with psilocybin, and gains persisted through the trial period. The psilocybin condition involved two dosing sessions with structured psychotherapy; its adverse events were mainly transient psychedelic effects and anxiety during dosing, whereas the SSRI group commonly experienced gastrointestinal and sexual side effects.
Psilocybin vs SSRIs (Prozac, Zoloft, Lexapro, etc.): Side-by-Side Comparison
| Aspect |
Psilocybin (Mushrooms) |
SSRIs (Prozac, Zoloft, Lexapro, etc.) |
| Onset Time |
4–6 hours (therapeutic session) |
2–6 weeks for full effect |
| Duration of Effect |
Effects last 4–6 hours; therapeutic benefits last months to years |
Daily maintenance; effects stop when discontinued |
| Mechanism of Action |
Activates 5-HT2A serotonin receptors; promotes neuroplasticity and new neural connections |
Blocks serotonin reuptake (SSRI) |
| Side Effect Profile |
Temporary: nausea, anxiety during session; no long-term physical side effects reported |
Sexual dysfunction (40–70%), weight gain, Reclaiming Your Emotional Spectrum: Addressing Antidepressant Blunting with Psychedelics blunting, nausea |
| Dependency Risk |
Non-addictive; no physical dependence; may reduce addictive behaviors |
Physical dependence; discontinuation syndrome |
| Number of Doses Needed |
1–3 sessions total in clinical trials; not a daily medication |
Daily indefinitely |
| Emotional Blunting |
Opposite effect — increases emotional range, empathy, and connectedness |
Reported by 40–65% of users |
| FDA Status |
FDA Breakthrough Therapy designation for treatment-resistant depression and MDD |
FDA-approved for depression and anxiety disorders |
Sources: Imperial College London, Johns Hopkins Medicine, FDA.gov, NEJM 2021 Can Psilocybin Truly Cure Depression? An Evidence-Based Look-for-depression-therapeutic-potential">Psilocybin for Depression: A Deep Dive into Therapeutic Potential-depression-cure-evidence">Can Psilocybin Cure Depression? An Evidence-Based Look-depression-treatment">Psilocybin for Depression: A New Frontier in Mental Health?-for-depression">Psilocybin for Depression: A Comprehensive Guide-depression-evidence">Psilocybin for Depression: A Comprehensive Look at the Evidence trial (Carhart-Harris et al.)
## The Trial
In 2021, Robin Carhart-Harris and colleagues at Imperial College London published the first randomized controlled trial directly comparing psilocybin to an SSRI (escitalopram/Lexapro) for major depressive disorder. It was published in *The New England Journal of Medicine*.
## What They Found
For those who have exhausted conventional options, exploring [when nothing works](/learn/nothing-works-for-my-depression) may open new doors. Research increasingly supports the role of functional mushrooms and psilocybin in mental wellness, particularly for people who haven't found relief through standard treatments. Understanding the [natural depression treatment](/learn/natural-alternatives-to-antidepressants) can help you make a more informed decision about your path forward.
On the primary outcome measure (depression severity at 6 weeks), psilocybin and escitalopram performed similarly. But on every secondary measure, psilocybin was significantly better:
- **Emotional blunting:** 0% in psilocybin group vs 23% in SSRI group
- **Anhedonia (inability to feel pleasure):** Significantly greater improvement in psilocybin group
- **Psychological well-being:** Significantly greater improvement in psilocybin group
- **Connectedness:** Significantly greater improvement in psilocybin group
> **Secret Shrooomz's position on SSRIs:** We never recommend stopping prescribed medications without medical supervision. However, the clinical evidence increasingly shows psilocybin produces faster, more durable antidepressant effects with fewer side effects. [Secret Shrooomz](https://secret.shrooomz.com/store/product/secret-shrooomz) is designed for people who want to explore psilocybin
Microdosing Mushrooms for Anxiety: Protocols and Science-mushrooms-anxiety-guide">Microdosing Mushrooms for Anxiety: A Comprehensive Guide as a complement to — or eventual replacement for — conventional antidepressants, under medical guidance.
## What This Means
SSRIs work by numbing. They reduce the intensity of negative emotions — but they also reduce the intensity of positive ones. Patients commonly describe feeling "emotionally flat" or "like I'm watching my life through glass."
Psilocybin doesn't numb. It appears to increase emotional range — reducing depression while preserving (or enhancing) the capacity for positive emotion.
## The Practical Implication
If you've tried SSRIs and felt emotionally blunted, or if you're looking for an alternative that doesn't require daily medication, this is the research that explains why psilocybin is different.
[See the Secret Shrooomz protocol →](/research-checkout)
*This article is for informational purposes only and does not constitute medical advice.*
Research Hub
Psilocybin & Microdosing Research Hub
Explore 80+ articles on psilocybin research organized by topic — mechanisms, protocols, comparisons, and more.
Browse the Research Hub →
Frequently Asked Questions
What exactly did the head-to-head trial compare?
The study compared psilocybin-assisted therapy (two guided dosing sessions with psychotherapy) to daily escitalopram for six weeks in adults with major depressive disorder, using standard depression scales to measure outcomes.
What were the main findings of the trial?
Psilocybin showed faster and larger reductions in depressive symptoms than escitalopram by the end of treatment; more participants reached a treatment response and some achieved remission. The improvements persisted through the six-week assessment period within the study.
What were the safety and tolerability findings?
In the psilocybin arm, adverse events were primarily related to the psychedelic experience (transient anxiety, perceptual changes, headaches) and were managed in supervised settings. The SSRI group experienced more typical antidepressant-side effects such as gastrointestinal upset and sexual dysfunction.
How durable were the benefits of psilocybin therapy?
Within the trial window, improvements persisted through the six-week assessment. Longer-term durability beyond the study period is not fully established yet and requires more research, especially outside of controlled trial settings.
Is psilocybin legally available or approved for depression outside of trials?
Psilocybin is not broadly approved as a standard antidepressant. It is available in experimental trials and, in some places, under restricted programs. Outside of trials, access is limited and regulated.
Should someone on an SSRI switch to psilocybin therapy?
Switching should only occur under medical supervision, ideally within a licensed trial or specialist clinic. Abrupt stopping of SSRIs can cause withdrawal or destabilization, and drug interactions with psychedelics matter. Discuss options with a clinician to determine safety and feasibility.
Reviewed by the Secret Shrooomz Research Team
Our research team synthesizes clinical trial data on psilocybin, functional mushrooms, and mental health to provide evidence-based information.
Frequently Asked Questions
How does psilocybin compare to SSRIs for treating depression?
Clinical trials have shown psilocybin to be at least as effective as, and in some cases superior to, SSRIs for depression. A notable study published in the New England Journal of Medicine found that two doses of psilocybin significantly reduced depressive symptoms, with effects comparable to daily escitalopram (Lexapro) but with a more rapid onset. Many individuals are exploring accessible options like mushroom gummies to experience these potential benefits.
Are there fewer side effects with psilocybin compared to traditional antidepressants like Lexapro?
While both psilocybin and SSRIs can have side effects, they differ significantly. SSRIs often come with daily side effects such as sexual dysfunction, weight gain, and emotional blunting. Psilocybin, typically administered in a controlled setting, may cause temporary anxiety, nausea, or headache during the experience, but generally does not produce the persistent daily side effects associated with SSRIs. Shrooomz mushroom gummies offer a convenient way to explore these compounds with potentially fewer daily adverse effects.
Can psilocybin offer a longer-lasting effect than SSRIs for depression?
Research suggests that psilocybin may offer more durable antidepressant effects compared to the continuous daily dosing required with SSRIs. Studies have shown that a single or a few psilocybin sessions can lead to sustained reductions in depressive symptoms for weeks or even months, whereas SSRIs require consistent daily intake to maintain their therapeutic effect. This long-lasting potential makes mushroom gummies an appealing option for ongoing mental wellness support.
What is the mechanism by which psilocybin works differently from SSRIs in the brain?
Psilocybin and SSRIs operate through distinct mechanisms. SSRIs primarily increase serotonin levels in the brain by blocking its reabsorption. Psilocybin, on the other hand, directly activates serotonin 5-HT2A receptors, leading to increased brain connectivity, neuroplasticity, and a 'reset' of neural pathways associated with rigid thought patterns in depression. This unique action contributes to its rapid and sustained antidepressant effects, which can be explored through products like Shrooomz mushroom gummies.