placebo effect
- Guideline or reference source
- FDAPNG Patient network glossary terms
- Definition
- Sometimes people taking a study medication receive benefits that are not from the chemicals in the medicine. This is called a “placebo effect.” For example, if a participant feels hopeful about a treatment, he or she may be more likely to notice positive changes than negatives ones. A researcher’s hope may also sway a participant’s response. Double-blind research design helps minimize the placebo effect.
- Related Term
- blinding
- placebo
- placebo comparator arm
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