The nocebo effect is the opposite of the placebo effect.
nocebo response
Frequency:
65
%
Her anxiety increased as a result of the nocebo response to the medication.
Idiomatic Expressions for nocebo
Phrase: nocebo response
Meaning: A negative reaction or symptom experienced by a person as a result of a negative expectation or belief.
Usage: The nocebo response to the new treatment was stronger than anticipated.