Scott Alexander, curated
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HPPD And The Specter Of Permanent Side Effects

Quality
64
Strong
Claude Shift
46
Moderate
RWI
2
of 10

Summary

On hallucinogen persisting perception disorder (a patient who took LSD once and never stopped hallucinating) and the broader puzzle of how a drug with a few-hours half-life can leave permanent effects. Surveys the speculative etiologies (excitotoxic death of inhibitory interneurons), the parallel of tardive dyskinesia (receptor-hypersensitivity vs neurotoxicity), post-SSRI sexual dysfunction, and protracted withdrawal, then closes on the conceptual fork: the comfortable neuron-death model vs the scarier 'body as a chaotic system settling into attractors' (the same frame Scott uses for depressive episodes).

Why this score

Quality 64 · Strong. 64 — low Strong. A competent, interesting psychopharmacology explainer with a genuinely nice conceptual payoff (attractor-states vs cell-death), but heavily reliant on block-quoted gated papers and admittedly all-speculative etiology. Firm low-Strong, not higher.

Claude’s paradigm shift 46 · Moderate. 46 — Moderate. The attractor-state framing of permanent side effects is a mild, useful reframing; the underlying material is a literature survey.

Real-world impact 2 · Minor. 2 — minor/within-blog. A niche pharmacology explainer; no policy or practice change.