Evidence map›Paper›PMID 42015338›Full record

Trial reportHuman psychopharmacology2026

No Evidence of Moderated Impulsivity Following Administration of the IMPase Inhibitor Ebselen in Healthy Adults.

Matthew P G John, Luke Earnshaw, Nikhil Gauri Shankar, Jawad Sultan Raja, Timothy J Davies, Phillip J Cowen, Trevor Sharp, Alberto Salmoiraghi, Robert D Rogers

Abstract readRandomized Controlled Trial
In one paragraph

Trial report in Human psychopharmacology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

0numbers the graph read from it
0cells of the map it votes in
0citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

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.

2 · The registry

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.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

0 citing papers in PubMed.

No citing paper in PubMed yet.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

9 authors.

Matthew P G JohnSchool of Psychology and Sports Science, Bangor University, Bangor, Gwynedd, UK.ORCID 0000-0002-4752-5440
Luke EarnshawSchool of Psychology and Sports Science, Bangor University, Bangor, Gwynedd, UK.
Nikhil Gauri ShankarMental Health and Learning Disability Division, Ysbyty Gwynedd, Penrhosgarnedd, Bangor, UK.
Jawad Sultan RajaMental Health and Learning Disability Division, Ysbyty Gwynedd, Penrhosgarnedd, Bangor, UK.
Timothy J DaviesSchool of Psychology and Sports Science, Bangor University, Bangor, Gwynedd, UK.
Phillip J CowenDepartment of Psychiatry, Warneford Hospital, University of Oxford, Oxford, UK.ORCID 0000-0001-5518-6138
Trevor SharpDepartment of Pharmacology, University of Oxford, Oxford, UK.ORCID 0000-0001-7434-9713
Alberto SalmoiraghiMental Health and Learning Disability Division, Ysbyty Gwynedd, Penrhosgarnedd, Bangor, UK.
Robert D RogersSchool of Psychology and Sports Science, Bangor University, Bangor, Gwynedd, UK.ORCID 0000-0001-5010-069X

Funding

Medical Research Council MR/L013150/1
6 · The paper itself

Abstract

objectiveImpulsivity is a transdiagnostic risk factor for numerous health morbidities and is strongly associated with early relapse and poor treatment outcomes in addictions and mood-disorders. Lithium carbonate can be helpful in moderating the impulsive behaviors associated with mania, possibly mediated by reduced myo-inositol activity following inhibition of the enzyme inositol monophosphatase (IMPase). We tested the hypothesis that impulsivity-as motor disinhibition, decisions without adequate information, and stronger preferences for small immediate rewards over larger later rewards-can be moderated by the IMPase inhibitor ebselen in healthy adult volunteers.

methodsOne hundred and thirty healthy adults completed a between-subjects, double-blind, placebo-controlled protocol. Over 2 days, participants received a previously validated dose of 1800 mg of ebselen or placebo before completing tests of impulsivity and decision-making.

resultsThere were no substantive changes in any measure of impulsivity following treatment with ebselen compared with placebo. Neither was there any convincing evidence of stronger treatment effects in high-trait impulsive participants compared with low-trait participants.

conclusionThese results fail to replicate findings that ebselen administration moderates validated measures of impulsivity in healthy adults, at least at doses shown to reduce myo-inositol within the medial prefrontal cortex and produce changes in emotional processing and reward-based learning.

Indexed as

Enzyme InhibitorsImpulsive BehaviorIsoindolesOrganoselenium CompoundsPhosphoric Monoester HydrolasesAdultDecision MakingDouble-Blind MethodFemaleHealthy VolunteersHumansMaleYoung AdultebselenEnzyme InhibitorsIsoindolesmyo-inositol-1 (or 4)-monophosphataseOrganoselenium CompoundsPhosphoric Monoester Hydrolasesebselenimpulsivityinositol monophosphatasemyo‐inositol

Identifiers

PMID42015338
PMCPMC13100343

What OpenQuestion holds

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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.