Non-inferiority (trial design)
A clinical trial design that tests whether a new treatment is no worse than an active comparator by more than a pre-defined margin — rather than testing whether it is better (superiority). The 2021 NEJM psilocybin vs escitalopram trial was a non-inferiority study: psilocybin was found non-inferior to the SSRI on the primary QIDS-SR outcome, meaning it performed at least as well. This is a meaningful finding — not a consolation. Non-inferiority with fewer side effects and a shorter treatment course represents a clinically significant advantage.
Full Explanation
Non-inferiority is a clinical trial design that tests whether a new treatment is no worse than an active comparator by more than a pre-defined margin — rather than testing whether it is better (superiority). The 2021 NEJM psilocybin vs escitalopram trial was a non-inferiority study: psilocybin was found non-inferior to the SSRI on the primary QIDS-SR outcome, meaning it performed at least as well. This is a meaningful finding — not a consolation. Non-inferiority with fewer side effects and a shorter treatment course represents a clinically significant advantage.
See: Psilocybin vs SSRIs (/guides/psilocybin-vs-ssris).
Why It Matters
Understanding non-inferiority helps you read the NEJM trial correctly: psilocybin "as good as" escitalopram is a strong result, especially with a shorter course and different side-effect profile.
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Psilocybin
A naturally occurring psychedelic compound found in certain mushrooms that produces altered states of consciousness.
Psilocin
The pharmacologically active compound that psilocybin converts to in the body, responsible for psychedelic effects.
Ego Death
A temporary dissolution of the sense of self during a psychedelic experience, often described as profound and transformative.
Set and Setting
The combination of mindset (set) and environment (setting) that shapes a psychedelic experience.
Microdosing
Taking sub-perceptual doses of psilocybin on a regular schedule for subtle cognitive and emotional benefits.
Mycelium
The vegetative part of a fungus, consisting of a network of fine white filaments that eventually produces mushrooms.