Placebo

A placebo is a substance containing no medication which is given to reinforce a patient's expectation to get well or, alternatively, used in medical experiments as a control measure.

In 2153, Dr. Phlox gave Commander Tucker a placebo after he wouldn't try Vulcan neuropressure therapy. 

Every flu season on the USS Voyager, Neelix became convinced that he had Toluncan ague. Rather than arguing with him, The Doctor would simply give him a placebo. 

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Placebo