A 1930 psychiatric case of mescaline use, rediscovered from unpublished hospital notes

The question

What can an unpublished 1930 clinical record tell us about how mescaline was first used in psychiatry, and what does it suggest for today’s research?

What they did

The authors examined original, previously unpublished clinical notes on a patient, Madame Louise Françoise R., who was given mescaline in 1930 by the psychiatrists Henri Claude and Henri Ey at the Sainte-Anne hospital in Paris. The notes, titled “Experiment - Mescaline”, record subcutaneous injections (under the skin) of 20-40 mg. The authors compared this with doses of 250-500 mg later recognized as producing full psychedelic effects, and traced what happened to the patient afterwards.

What they found

The doses used appear to have been below the threshold for a full psychedelic effect, and the authors judge that the doctors’ aim was exploratory - using mescaline as a probe to study how symptoms arise - rather than curative. The notes describe coloured visions and depersonalisation (a sense of detachment from oneself), and include the phrase “mescaline releases but does not create fantasies”. A few days later the same patient was given malariotherapy, a shock treatment that induces fever. The clinical improvement recorded followed the fever therapy, not the mescaline. The case also predates the doctors’ own official publication on mescaline by four years.

The fine print

This is one patient, described in archival notes almost a century old, with no standardized rating scales, no comparison group and no follow-up data as reported here. Historical records can be incomplete and the authors’ reading of the doctors’ intent is an interpretation, not a documented fact. Ethical standards of the time, including consent, were far weaker than today. This summary is based on the abstract alone.

What it means

The case is a reminder that early psychedelic research in psychiatry was often exploratory rather than therapeutic, and that any apparent improvement in a single patient can easily be due to another treatment given at the same time.

Evidence grade: Very low. This is a single historical case reconstructed from archival clinical notes, with no control group, no standardized outcome measures and no way to verify the records independently.

This summary is based on the study’s published abstract.