CHICAGO, IL - APRIL 14: Tylenol, which contains acetaminophen, is shown on April 14, 2015 in Chicago, Illinois. New research has shown that acetaminophen, which is found in many over-the-counter painkillers, can dull feelings of pleasure. Previous research found that the medication had a similar effect with feelings of dread. (Photo Illustration by Scott Olson/Getty Images)
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