The effect of open‐label placebo on allergic rhinitis symptoms: A systematic review and meta‐analysis of randomized controlled trials.

Key points The evidence regarding the open‐label placebo effect on allergic rhinitis symptoms remains uncertain. Open‐label placebo significantly reduced the frequency of symptoms in allergic rhinitis patients with similar safety profiles; however, there was no effect on the severity of symptoms and impairment due to symptoms. The statistically significant impact on symptom frequency can be considered not clinically significant. [ABSTRACT FROM AUTHOR]