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n. pl. no·ce·bos or no·ce·boes
A substance that causes undesirable side effects as a result of a patient's perception that it is harmful rather than as a result of a causative ingredient.

[Latin nocēbō, I will harm, first person sing. future tense of nocēre, to harm (on the model of placebo); see nek- in Indo-European roots.]
References in periodicals archive ?
Therefore, a nocebo effect is where a person's symptoms are worsened by the fake medicine in a drug trial.
The increase in symptoms that followed each of the specific food challenges could have been due to a nocebo effect (i.
For example, in a trial of anti-migraine medication, if the active ingredient is an anticonvulsant, the nocebo effect (the placebo's side effect) will disproportionally relate to anorexia or memory; but if the active ingredient is a non-steroidal anti-inflammatory drug, the nocebo effect will more likely be gastrointestinal symptoms and thirst.
They also discuss the dark side of the placebo effect: the nocebo effect.
A recent review of 100 MS clinical trials over the past 20 years found a prominent nocebo effect.
Studying the nocebo effect is difficult ethically because doctors would need to tell the patient, "'Now I'm going to give you a substance that will increase your pain' but actually give a placebo," says neuroscientist Fabrizio Benedetti.
The nocebo effect is one that turns on the expectations of no benefit or even negative changes.
When words are painful: unraveling the mechanisms of the nocebo effect.
Although traditionally viewed as a positive phenomenon--the common sense model of the placebo effect is one in which an individual benefits from false information such as "the tablet I am about to give you will enhance your power output in the upcoming competition"--growing experimental support for the idea of the nocebo effect suggests that placebo/nocebo responsiveness might represent a disadvantage to an individual.
In our opinion, this may have lead to a nocebo effect for this particular intervention.
Possibly these effects--which were purely subjectively reported by the women--were due to a nocebo effect in these non-blinded studies.
We've probably all suffered the nocebo effect, developing symptoms in response to somebody else's symptoms or upon receiving a diagnosis of illness.