Blockmans, Daniel, Persoons, Philippe, Van Houdenhove, Boudewijn et al. · The American journal of medicine · 2006 · DOI
This study tested whether methylphenidate (a stimulant medication) could help reduce fatigue and improve concentration in ME/CFS patients. Sixty patients took either methylphenidate or placebo for 4 weeks each in alternating order. The medication did reduce fatigue and concentration problems compared to placebo, but only about 17–22% of patients showed clinically meaningful improvement.
This is one of the few randomized controlled trials testing a pharmacological intervention in ME/CFS, addressing the lack of evidence-based medical treatments. The findings suggest methylphenidate may benefit a subset of patients with significant cognitive symptoms, potentially opening avenues for future research into responder characteristics and optimal dosing strategies.
This study does not establish that methylphenidate is an effective treatment for ME/CFS broadly—only 17–22% of patients showed clinically meaningful benefit. The short 4-week duration means long-term safety and efficacy are unknown, and the study does not identify which patient characteristics predict response to treatment.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
The first block is for the primary paper and is the citation you should use in research work. The atlas-snapshot line only applies if you are specifically referring to this atlas’s reading of the paper on the date shown.
Primary citation
Blockmans, Daniel, Persoons, Philippe, Van Houdenhove, Boudewijn, & Bobbaers, Herman (2006). Does methylphenidate reduce the symptoms of chronic fatigue syndrome?. The American journal of medicine. https://doi.org/10.1016/j.amjmed.2005.07.047
BibTeX
@article{mecfsatlas-blockmans-2006-does-methylphenidate,
author = {Blockmans, Daniel and Persoons, Philippe and Van Houdenhove, Boudewijn and Bobbaers, Herman},
title = {Does methylphenidate reduce the symptoms of chronic fatigue syndrome?},
journal = {The American journal of medicine},
year = {2006},
doi = {10.1016/j.amjmed.2005.07.047},
note = {PubMed: 16443425},
url = {https://www.mecfsatlas.com/evidence/blockmans-2006-does-methylphenidate},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-29. https://www.mecfsatlas.com/evidence/blockmans-2006-does-methylphenidate
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