Placebo Effect

  1. Ronald Eccles1,
  2. Khawla Sadiq Jawad Eccles2

Published Online: 27 JAN 2006

DOI: 10.1038/npg.els.0004114



How to Cite

Eccles, R. and Eccles, K. S. J. 2006. Placebo Effect. eLS. .

Author Information

  1. 1

    Cardiff University, Cardiff School of Biosciences, UK

  2. 2

    University of Wales Institute, School of Applied Sciences, Cardiff, UK

Publication History

  1. Published Online: 27 JAN 2006


The placebo effect is the beneficial therapeutic effect of an inactive or nonspecific treatment. The placebo effect may explain the benefit of complementary medicine such as aromatherapy and reflexology.


  • placebo;
  • nocebo;
  • complementary medicine;
  • clinical trials;
  • ethics