Olson, L G, Ambrogetti, A, Sutherland, D C · Psychosomatics · 2003 · DOI
This small study tested whether dexamphetamine, a stimulant medication, could help people with ME/CFS feel less tired and improve their quality of life. Over 6 weeks, 10 patients took dexamphetamine and 10 took a placebo (inactive pill). Nine out of 10 people on dexamphetamine reported improvement in their fatigue scores, compared to only 4 out of 10 on placebo. The researchers concluded that dexamphetamine might be helpful for ME/CFS, but a larger study is needed to confirm these results.
ME/CFS currently lacks FDA-approved pharmacological treatments, making any controlled evidence of symptom improvement clinically relevant. This pilot study provides preliminary evidence that stimulant medications might address fatigue severity, potentially opening a new therapeutic avenue for a debilitating condition where treatment options are severely limited.
This pilot study does not establish that dexamphetamine is safe or effective as a standard ME/CFS treatment—it is too small and short to draw definitive conclusions. The study does not clarify mechanisms of action, optimal dosing, long-term safety, or whether benefits persist beyond 6 weeks. It also does not address whether dexamphetamine might worsen post-exertional malaise, a core ME/CFS feature.
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 →
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