A placebo refers to a substance identical in appearance to a drug but physiologically inert.

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A placebo is a substance that has no therapeutic effect but is given to a patient to satisfy the psychological need for medication. It is usually used in clinical trials to compare the effectiveness of a new drug with a placebo. The placebo is identical in appearance to the drug being tested but does not contain any active ingredients.

A Placebo Refers to a Substance Identical in Appearance to a Drug