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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.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
False medical information can also lead to patients' experiencing greater side effects through the "nocebo effect." Sometimes patients benefit from an intervention simply because they believe they will -- that's the placebo effect.
Expectation has other powerful effects, such as the placebo effect and the nocebo effect. So, taking research on expectation into account, and having aged myself, and witnessed the effects of aging on those around me, here's what I suspect contributes to some of the cognitive decline shown in tests of elderly subjects: self-fulfilling prophecy.
In that regard, experts from Aspetar agree with the authors of this study, who suggested that one of the contributing factors to this decline could be a phenomenon known as the Nocebo effect, or 'imaginary/anticipatory fatigue'.
Just as much as someone could get better with the placebo effect, the opposite can happen through what's called the nocebo effect, when someone believes that they will get worse or will die from a disease.
A nocebo effect is when the mere suggestion of side effects is enough to bring on negative symptoms.
If a player is fasting in relatively easy conditions, such as in Qatar, where it's quite possible to maintain one's health when following the right diet and exercise regimen, and staying out of the extreme heat during summer months, the eventual fatigue suffered could very well be a result the nocebo effect rather than the fasting's effect on the body."
The nocebo effect: a reason for patients' non-adherence to generic substitution?
The thyroid drug replacement Levothyrox has recently been at the center of one of the most significant nocebo effect hype-cycles of recent history and perhaps, ever.
One attempt to implicitly condition placebo hypoalgesia by using a tactile cue (direction in which a placebo cream was applied to the skin) was not successful in inducing placebo hypoalgesia [43], but a recent study indicated that contingency awareness is not necessary to induce a nocebo effect in heat-pain perception [58].
Furthermore, the study noted that an additional 8% of the 3D viewers expressed discomfort that arose either as a result of the 3D glasses or due to the nocebo effect in the form of negative presumptions regarding 3D viewing [4, 6].
As there was no placebo arm in this trial, the authors speculated that in real-life situations, patients might be experiencing their symptoms due to psychological anticipation of intolerance when exposed to gluten and thereby suggesting a nocebo effect. Although it has been shown that NCGS patients did not show an increased tendency for general somatization, emotional factors may still play a role [18].
A recent Vox article tells of the placebo effect's evil twin, the nocebo effect, that gives patients worse side effects when a drug costs more money.