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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 ?
And they are dying because of a nocebo effect, in my opinion.
For others, however, the symptoms likely come from somewhere besides gluten or may be a nocebo effect, where a patient who expects negative symptoms becomes more likely to have them.
Redirecting Anti-Wind Energy, The Nocebo Effect and more: ajmag.
In our study none of the doctors knew the concept of Nocebo Effect of Informed Consent (NEIC).
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 first is a nocebo effect, which I define as a negative health effect of negative expectations about a therapy (or product).
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.