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Home/Orcapedia/Why Do Clinical Trials Use Placebos?
Placebos are used in some clinical trials to help researchers determine whether a new treatment provides benefits beyond those expected from natural recovery, treatment context, expectations and other non-specific influences. They are a scientific comparison tool — not the goal of the study.
People often improve over time because diseases naturally fluctuate, symptoms regress toward the average, or extra medical attention changes behaviour. Without a comparison group, it is difficult to know whether a treatment truly caused the improvement.
Participants are randomly assigned to receive either the investigational treatment or an inactive placebo that resembles it as closely as possible. Randomisation and blinding help reduce bias when ethically appropriate.
In a double-blind trial, neither participants nor researchers know who receives the active treatment until the study ends. This reduces the influence of expectations and unconscious bias on outcomes.
No. Many studies compare a new treatment against the current standard of care instead of a placebo. When an effective treatment already exists, using a placebo alone may be unethical if it means withholding proven therapy.
It helps estimate the specific effect of the treatment beyond placebo responses, natural recovery, measurement effects and other influences. It does not imply that improvements in the placebo group are 'fake'.
Modern clinical research follows strict ethical principles, including informed consent, independent ethics review and careful consideration of participant safety. Placebo use must be scientifically justified and ethically appropriate.
Placebos are valuable scientific tools that improve the reliability of medical research. They help distinguish treatment-specific effects from other factors while protecting participants through ethical oversight.
The purpose of a placebo-controlled trial is not to prove that medicine 'doesn't work'. It is to answer a more useful question: how much benefit comes from the treatment itself, and how much comes from the remarkable ways human biology responds to care, expectation and time?
“Placebo groups receive no care” — False. Participants continue to receive monitoring and, when appropriate, standard treatment.
“Every trial uses placebos” — False.
“Placebos are used to deceive people” — False. Ethical trials require informed consent.
“The science of wellbeing is rarely black and white.”