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Bramante et al. — Randomized Trial of Metformin, Ivermectin, and Fluvoxamine for Covid-19

New England Journal of Medicine, 2022 · 10.1056/nejmoa2201662

INCONCLUSIVE

In plain language

COVID-OUT was a real, properly double-blinded randomized trial that gave overweight or obese adults with early Covid one of three cheap repurposed drugs (metformin, ivermectin, fluvoxamine) or placebo, to see if the drugs kept people out of trouble in the first 14 days. The honest headline is correct: none of the three drugs prevented the trial's main outcome. The catch is what that main outcome mostly WAS — not hospitalisation or death (those were rare), but a home pulse-oximeter reading of 93% or lower, a measurement the authors themselves admit was often spurious or recalled from memory with no record. So the trial's primary result is a clean null measured on a noisy, self-reported endpoint. The number people quote to argue "metformin works" is a SECONDARY result (fewer ED visits/hospitalisations, relative risk 0.56) that is real in the raw data but is one nominally-significant cell out of many comparisons, is not corrected for that multiplicity, and vanishes on the hardest endpoint (hospitalisation-or-death, which crosses no-effect). Importantly, I checked the pre-registered protocol and statistical plan directly: the analysis population and the composite primary were both pre-specified exactly as published — so unlike its sibling TOGETHER, this trial did NOT construct its denominator or switch its outcome after the fact. The paper is methodologically sound and restrained; the problem is downstream over-reading, not the paper itself.

Flags

No flags were filed as separate structured items — the assessment above carries the finding. A verdict is never “held up” while an integrity issue stands.

Next leads — where to look next

• 10.1016/S1473-3099(23)00299-2 same-author
  Bramante et al.'s long-Covid follow-up runs the SAME COVID-OUT mITT population and the same metformin arm onto an even softer, self-reported outcome (post-Covid condition); its "metformin cut long Covid ~41%" headline inherits the identical soft-endpoint + multiplicity + unverified per-arm-exclusion risks flagged here.
• 10.1016/S2214-109X(21)00448-4 methodological-sibling
  TOGETHER (fluvoxamine) is cited in COVID-OUT's own SAP (p.36) as the basis for its fluvoxamine power — the explicit parent; a shared-placebo platform trial with a composite endpoint and mITT, where (unlike COVID-OUT) the post-randomisation denominator construction is the live question.
• 10.1001/jama.2022.18590 methodological-sibling
  ACTIV-6 ivermectin (co-investigator D. Boulware) is a decentralised outpatient repurposed-drug platform whose PRIMARY is a self-reported time-to-sustained-recovery endpoint — the same soft, self-measured-outcome + shared-placebo-denominator pattern that makes COVID-OUT's primary weak deserves the same scrutiny.

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