Collatz, Ansel, Johnston, Samantha C, Staines, Donald R et al. · Clinical therapeutics · 2016 · DOI
Researchers searched for studies testing medications for ME/CFS and found 26 high-quality trials. While 10 medications showed some benefit in their respective studies, no single medication worked well for everyone with ME/CFS. This suggests that different patients may need different treatments, and more research is needed to find which medications help which patients.
This review is crucial because ME/CFS patients often use multiple medications without clear evidence of benefit, creating unnecessary medication burden and potential side effects. By demonstrating that no single drug works universally and recommending future trials use consistent diagnostic criteria, it directs research toward identifying medication subgroups—meaning certain drugs might help certain patients rather than all patients.
This review does not prove that medications are ineffective for ME/CFS—only that current evidence is insufficient and contradictory. It does not establish which biological mechanisms (if any) medications successfully target, nor does it identify which patient subgroups might benefit from specific treatments. The exclusion of combined pharmacological and behavioral interventions means this review does not address how drugs might work alongside other approaches.
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
Collatz, Ansel, Johnston, Samantha C, Staines, Donald R, & Marshall-Gradisnik, Sonya M (2016). A Systematic Review of Drug Therapies for Chronic Fatigue Syndrome/Myalgic Encephalomyelitis.. Clinical therapeutics. https://doi.org/10.1016/j.clinthera.2016.04.038
BibTeX
@article{mecfsatlas-collatz-2016-systematic-review,
author = {Collatz, Ansel and Johnston, Samantha C and Staines, Donald R and Marshall-Gradisnik, Sonya M},
title = {A Systematic Review of Drug Therapies for Chronic Fatigue Syndrome/Myalgic Encephalomyelitis.},
journal = {Clinical therapeutics},
year = {2016},
doi = {10.1016/j.clinthera.2016.04.038},
note = {PubMed: 27229907},
url = {https://www.mecfsatlas.com/evidence/collatz-2016-systematic-review},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-26. https://www.mecfsatlas.com/evidence/collatz-2016-systematic-review
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