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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 ?
Subsequent chapters address placebo design, active placebos, and other design features for identifying, minimizing, and characterizing placebo response; psychological processes that can bias responses; the case for changing the term "placebo effect"; effects in complementary and alternative medicine; meta-analyses and experimental studies; the role of desire, expectation, and reduced negative emotions in placebo anti-hyperalgesia in irritable bowel syndrome; placebo, pain, and surgery; placebo interventions for pain; how communication between clinicians and patients may impact pain perception; nocebos in daily clinical practice; recommendations for pain management; and ethical issues.
Sleep paralysis: nightmares, nocebos, and the mind-body connection.
Section Four, "Essays and Commentaries," examines aromatherapy and essential oils and homeopathy, the placebo effect, and herbs as a token and nocebos.
Many people, including health professionals, are less familiar with the nocebo response.
These are not the same as nocebo effects, which are the responses to a substance believed by the subject to be able to cause harm.
The nocebo effect is one that turns on the expectations of no benefit or even negative changes.