Pilot randomized active-placebo-controlled trial of low-dose ketamine for the treatment of multiple sclerosis–related fatigue, 2020, Fitzgerald et al

Very weak:
Results:
In total, 18 participants were enrolled; 67% participants received ketamine. Side effects of ketamine were transient. No change in the DFS (Daily Fatigue Severity) was observed after 7 days (−0.10 point; 95% confidence interval (CI): −0.32, 0.12; p = 0.40). We observed a trend in reduced FSS scores at 1 week (−5.2 points; 95% CI: −10.4, 0.14; p = 0.06) and a clinically and statistically significant reduction in MFIS score at day 28 (−13.5 point; 95% CI: −25.0, −1.98; p = 0.04).

Conclusions:
Ketamine infusions were safe and well-tolerated. While no change in DFS after 7 days was observed, secondary analyses suggest a benefit of ketamine infusion for reduction of longer term fatigue severity in people with MS.
1 month is probably too short.

This is puzzling, the placebo is an anesthesia drug:
Midazolam, marketed under the trade name Versed, among others, is a benzodiazepine medication used for anesthesia, procedural sedation, trouble sleeping, and severe agitation. It works by inducing sleepiness, decreasing anxiety, and causing a loss of ability to create new memories
Weird.
 
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