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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 ?
The placebo and nocebo effects on peak minute power during incremental arm crank ergometry.
Some pseudoscientific therapies, if given with love, enthusiasm, and delivered in a manner that fosters optimism, may be more effective than a conventional and 'proven' therapy that is delivered in a cold, pessimistic manner, owing to the placebo and nocebo effects.
El efecto nocebo, en otros tiempos conocido como maldicion, profecia o brujeria, es desde hace algunas decadas motivo de estudio e investigacion por centros de neurociencias, laboratorios quimicofarmaceuticos e incluso especialistas en mercadotecnia, ya que sus repercusiones tambien afectan las ganancias de las empresas farmaceuticas.
Warnings of a number of common side-effects listed on statin information leaflets were giving rise to nocebo symptoms despite having no provable connection with the drugs, the researchers found.
Emerge sempre di piu la necessita di gestione da parte del fisioterapista dei fattori contestuali (quali comunicazione, rapporto terapista-paziente, setting terapeutico) come elemento di supporto di qualsiasi trattamento manuale e non, per aumentare l'effetto placebo ed evitare il dannoso effetto nocebo (41).
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.
The contrary of the placebo effect is called the nocebo effect; as the former shows that the positive belief in a conviction can have a very beneficial influence, the latter proves the opposite: the "imaginary invalid" may be more difficult to treat than a real invalid (Bingel, 2014; Hauser, Hansen, & Enck 2012).
e placebo group (n = 6; 3 male and 3 female) and Nocebo group (n = 5; 3 female and 2 male).
Dans la plupart des cas, il s'agit de manipulations inutiles, voire dommageables pour la relation soignant/soigne (administration d'un nocebo, manipulation des croyances, etc.
Rojas- Nocebo effect in randomized clinical Front Behav
Se trata aqui del efecto contrario, el nocebo, que opera bajo los mismos principios que el placebo.