Psilocybin and OCD — what happened to my intrusive thoughts

I have OCD. Formally diagnosed at 22, now 34. I've been on fluvoxamine for six years with moderate success — it reduces the severity without eliminating intrusive thoughts. I've done CBT, specifically ERP (exposure and response prevention). I manage. This is the story of what happened when I added psilocybin.

What OCD Feels Like From Inside

For people who don't have it: OCD intrusive thoughts are not just worrying. They're specific, often horrifying thoughts that arrive unbidden, feel intensely real, and generate compulsive behaviors as attempts to neutralize them. The thoughts know your weak points — they attack the things you most care about. ERP works by repeatedly exposing yourself to the thoughts without performing the compulsion, which gradually reduces the distress. It works, and it's brutal.

What Psilocybin Did

At 2.5g, around the 2-hour mark, the OCD thoughts arrived — which I'd prepared for and discussed with my sitter. What I had not prepared for was what happened next: the thoughts arrived, and something in me simply observed them. Not suppressed them. Not performed a compulsion. Observed them from a position that felt genuinely separate from the thought.

The therapeutic literature describes this as "metacognitive awareness" — the capacity to observe thoughts as events rather than facts. In OCD treatment, building this awareness is a years-long project. For several hours, I had access to it without effort. The thoughts were present. They weren't running me.

I want to be precise here: this wasn't euphoria making the thoughts feel unimportant. The content was still distressing. The difference was my relationship to the content. I could watch the thought arrive, notice I was having it, and — during the session — not merge with it.

Integration

The weeks following were notable. The OCD baseline was lower — not gone, but measurably reduced. My sitter (a therapist) suggested this might be the CSTC loop disruption that researchers propose as the mechanism for psilocybin's potential in OCD: the cortico-striato-thalamo-cortical loop that is overactive in OCD may be temporarily disrupted, breaking the cycle.

Over the following 3 months, the benefit gradually returned toward my baseline. I've done two subsequent sessions. Each has produced a similar pattern — temporary meaningful reduction followed by gradual return. I'm not "cured." But the data suggests something real is happening.

The University of Arizona OCD trial (Goodman et al.) is the primary published clinical data. The results were significant. I hope it generates the Phase 2 research that's clearly needed.