Volume 35, Issue 5 e2740
RESEARCH ARTICLE

Methylphenidate challenge test in adults with attention deficit/hyperactivity disorder (ADHD): Clinical effects and their predictors

Daria Piacentino

Corresponding Author

Daria Piacentino

Department of Psychiatry, Central Hospital, Sanitary Agency of South Tyrol, Bolzano-Bozen, Italy

NESMOS (Neurosciences, Mental Health, and Sensory Organs) Department, School of Medicine and Psychology, Sapienza University of Rome, Rome, Italy

Correspondence

Daria Piacentino, Department of Psychiatry, Central Hospital, Sanitary Agency of South Tyrol, Lorenz-Böhler-Straße 5, 39100 Bolzano-Bozen, Italy.

Email: [email protected]

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Pietro De Rossi

Pietro De Rossi

NESMOS (Neurosciences, Mental Health, and Sensory Organs) Department, School of Medicine and Psychology, Sapienza University of Rome, Rome, Italy

ASL RM5, SPDC Monterotondo, Rome, Italy

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Georgios D. Kotzalidis

Georgios D. Kotzalidis

NESMOS (Neurosciences, Mental Health, and Sensory Organs) Department, School of Medicine and Psychology, Sapienza University of Rome, Rome, Italy

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Ignazio Maniscalco

Ignazio Maniscalco

Department of Psychiatry, Central Hospital, Sanitary Agency of South Tyrol, Bolzano-Bozen, Italy

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Maurizio Pompili

Maurizio Pompili

NESMOS (Neurosciences, Mental Health, and Sensory Organs) Department, School of Medicine and Psychology, Sapienza University of Rome, Rome, Italy

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Giancarlo Giupponi

Giancarlo Giupponi

Department of Psychiatry, Central Hospital, Sanitary Agency of South Tyrol, Bolzano-Bozen, Italy

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Christoph Hiemke

Christoph Hiemke

Klinik für Psychiatrie und Psychotherapie, Universitätsklinikum Mainz, Mainz, Germany

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Andreas Conca

Andreas Conca

Department of Psychiatry, Central Hospital, Sanitary Agency of South Tyrol, Bolzano-Bozen, Italy

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First published: 12 August 2020

Abstract

Objective

Adult and children attention deficit/hyperactivity disorder (ADHD) share similar symptoms and responses to drugs such as methylphenidate (MPH). Yet, in Europe, these drugs remain unlicensed for adults. We aimed to assess the effects of an acute MPH challenge on the four dimensions concentration, impulsivity, tension, and general well-being in ADHD adults, and identify predictors of improvement.

Methods

Therapeutic Drug Monitoring was performed to measure MPH plasma levels. A Visual Analogue Scale was administered to patients before and after the acute MPH challenge to measure self-reported changes in the four dimensions.

Results

After the acute MPH challenge, our 71 patients showed significant improvement in concentration and tension. The MPH challenge dose correlated with lower patients' age, greater side effects, increased concentration (p = .008) and decreased tension (p = .001). At multiple linear regression MPH plasma levels and absence of postdose side effects predicted concentration improvement, MPH plasma levels predicted tension improvement. MPH plasma levels were significantly higher in patients who reported an improvement in concentration, tension, and impulsivity compared to nonimprovers (p’s from .001 to .004).

Conclusions

These findings point to the efficacy of MPH challenge in improving concentration and tension in adult ADHD, thus emphasizing the need for a broader treatment access for these patients.

CONFLICT OF INTERESTS

All authors declare the absence of any sort of conflict of interests.

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