An inert substance that may be administered instead of a drug to see if it produces any of the same effects as the drug is called a

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A placebo is an inert substance given to study participants in place of an active drug, and is used to determine if the effects observed in the group receiving the active drug are actually due to the drug itself, or if they are instead due to other factors such as participant expectations, biases, or chance. Placebos are essential controls in many types of clinical trials and are often used in double-blind studies.

An Inert Substance That May Be Administered Instead of a Drug