What is a placebo?

A placebo is a “false pill” or “flour pill” that has no recognized physiological effect. In fact, a placebo is a pharmacologically inactive medication that is given in order to evaluate the possible psychological effect of a study medication. In cases where they are used, participants are advised in advance of the possibility that they will receive a placebo, as well as the reasons why the use of a placebo is necessary for the study.

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