Trial reportJournal of clinical sleep medicine : JCSM : official publication of the American Academy of Sleep Medicine2025
A proof-of-concept study of pitolisant for excessive daytime sleepiness in patients with Prader-Willi syndrome.
Trial report in Journal of clinical sleep medicine : JCSM : official publication of the American Academy of Sleep Medicine, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT04257929 (A Randomized, Double-Blind, Placebo-Controlled Phase 2 Study to Evaluate the Safety and Efficacy of Pitolisant in Patients With Prader-Willi Syndrome, Followed by an Open Label Extension), which is not on this map. Cited by 1 paper.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
A Randomized, Double-Blind, Placebo-Controlled Phase 2 Study to Evaluate the Safety and Efficacy of Pitolisant in Patients With Prader-Willi Syndrome, Followed by an Open Label Extension
Who cites it
1 citing paper in PubMed.
- Patient advocacy group perspectives on treatment priorities and clinical trials for the rare neurodevelopmental condition, Prader-Willi syndrome.Orphanet journal of rare diseases · 2026Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
12 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
STUDY
objectivesThe majority of patients with Prader-Willi syndrome experience excessive daytime sleepiness (EDS). This study evaluated the effects of pitolisant, a histamine 3 (H
methodsIn this phase 2, randomized, double-blind, placebo-controlled, proof-of-concept study, patients ages 6-65 years with a confirmed diagnosis of Prader-Willi syndrome with EDS were randomized 1:1:1 to receive lower-dose pitolisant (children/adolescents/adults, 8.9/13.35/17.8 mg), higher-dose pitolisant (children/adolescents/adults, 17.8/26.7/35.6 mg), or matching placebo for 11 weeks (3-week titration/8-week maintenance). The primary endpoint was change from baseline to week 11 in Epworth Sleepiness Scale for Children and Adolescents (parent/caregiver version) score. Other measures included the Caregiver Global Impression of Severity for EDS, Aberrant Behavior Checklist-Community, second edition, and Hyperphagia Questionnaire for Clinical Trials.
resultsOf 65 patients randomized and treated, 59 (90.8%) completed the double-blind phase. Least-squares (LS) mean improvement from baseline to week 11 in Epworth Sleepiness Scale for Children and Adolescents score was greater for higher-dose pitolisant (-5.0) vs placebo (-3.9; LS mean [standard error] difference, -1.1 [1.52]), but not for lower-dose pitolisant (-3.5) vs placebo (LS mean [standard error] difference, 0.5 [1.6]). The largest effect of pitolisant was seen in children (ages 6 to < 12 years; LS mean [standard error] difference for higher-dose pitolisant vs placebo, -3.5 [1.90]). Improvements were observed across other measures, especially in the higher-dose pitolisant group, including LS mean (standard error) change of -5.5 (1.2) on the irritability domain of the Aberrant Behavior Checklist-Community, second edition, and -3.1 (1.0) on the Hyperphagia Questionnaire for Clinical Trials. The most common adverse events in pitolisant-treated patients (doses pooled) were anxiety, irritability, and headache (11.9% each), consistent with the known safety profile of pitolisant.
conclusionsResults of this proof-of-concept study support further evaluation of pitolisant in patients with Prader-Willi syndrome and EDS. CLINICAL
trial registrationRegistry: ClinicalTrials.gov; Name: A Phase 2 Study to Evaluate the Safety and Efficacy of Pitolisant in Patients With Prader-Willi Syndrome, Followed by an Open Label Extension; URL: https://clinicaltrials.gov/study/NCT04257929; Identifier: NCT04257929. CITATION: Revana A, Bhattacharjee R, Miller JL, et al. A proof-of-concept study of pitolisant for excessive daytime sleepiness in patients with Prader-Willi syndrome.
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