European journal of neurology : the official journal of the European Federation of Neurological Societies
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Review Meta Analysis
Nocebo in fibromyalgia: meta-analysis of placebo-controlled clinical trials and implications for practice.
Nocebo refers to adverse effects (AEs) generated by negative expectations that medical treatment will likely harm instead of heal and can be assessed in placebo-controlled randomized clinical trials (RCTs). We examined AEs following placebo administration in RCTs for fibromyalgia (FM), a condition characterized by patients' poor medication adherence, which may affect outcome and/or increase healthcare costs. ⋯ Nocebo is remarkably prevalent in FM patients participating in RCTs. Because nocebo contributes to drug intolerance and treatment failure in clinical practice, identification of predisposing factors and efforts to prevent nocebo by educating these patients appropriately may be important for FM outcome.