According to a new systematic review, placebo treatment in clinical trials of migraine prophylaxis results in responder rates ranging from 0–56%, probably owing to variable combinations of spontaneous improvement and genuine placebo effects. Clinicians who treat patients with migraine should be aware of the potential nonspecific effects of any treatment modality.
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Tfelt-Hansen, P., Hougaard, A. Differential effects of placebos in migraine clinical trials. Nat Rev Neurol 10, 10–11 (2014). https://doi.org/10.1038/nrneurol.2013.255
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DOI: https://doi.org/10.1038/nrneurol.2013.255