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Placebo effect
- Molecular classification
- Other (psychological/psychobiological mechanism; not a molecular classification)
01
Overview
The placebo effect is a psychobiological phenomenon in which a patient's symptoms improve after administration of an inert treatment, attributed to psychological and neurobiological mechanisms such as expectation, conditioning, and endogenous neurotransmitter release. It is not a single molecule, receptor, or therapeutic target, but encompasses mind-brain-body interactions that can modulate symptoms, especially those with a strong subjective component like pain and depression. The placebo effect is important in clinical research as a control for new treatments, and understanding it has ethical implications in clinical practice and research[1][3][5][7].
- Other names
- Placebo responseplacebo phenomenon
02
Mechanism of action
Activation of endogenous opioid and dopaminergic pathways; Psychological conditioning and expectancy mechanisms[3][5]; Reduction of anxiety, altered symptom perception, and behavioral changes[2][7]
03
Biological functions
Symptom modulation through expectation and conditioningPsychobiological modulation via brain-body interactionEndogenous opioid and neurotransmitter activation in the brain
04
Disease associations
Other (is observed broadly across diseases, particularly those with a strong subjective symptom component, such as pain, depression, Parkinson’s disease, and certain immune conditions)
05
Safety considerations
Ethical challenges in clinical trial design (e.g., deception, withholding effective treatment)[1]Undesirable outcomes, known as the "nocebo effect," where negative expectations cause adverse effects[1][6]
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