Placebo
A dummy treatment with no active medicine, used for comparison.
What it means
A placebo is made to look, taste, and feel like the real treatment but contains no active ingredient. It is given to one group so results can be compared against the group receiving the active treatment.
Why it matters if you take part
People often feel differently simply because they are receiving attention and expect to improve. Comparing against a placebo separates that effect from the treatment itself. In most trial records there is no placebo group at all.
What it looks like in practice
Look for an arm labelled "Placebo Comparator". A trial being placebo-controlled does not necessarily mean anyone goes untreated — often the placebo is given on top of usual care.
Related terms
Trials recruiting now that include a placebo group
568 recruiting trials in our Canadian corpus include a placebo group.
A Study to Determine the Efficacy and Safety of Finerenone on Morbidity and Mortality Among Hospitalized Heart Failure Patients
Heart Failure · PHASE3
A Safety and Tolerability Study of HJB647 in Heart Failure Participants With Reduced Ejection Fraction
Heart Failure With Reduced Ejection Fraction · PHASE1
An Efficacy and Safety Study of Intravenous Anifrolumab to Treat Systemic Lupus Erythematosus in Pediatric Participants
Systemic Lupus Erythematosus · PHASE3
A Phase III Study to Assess the Effect of FDC Laroprovstat/Rosuvastatin Compared With Laroprovstat, Rosuvastatin and Placebo on LDL-C in LLT-naïve Patients.
Hypercholesterolaemia · PHASE3
A Study to Evaluate Effect of AZD6234 as an Adjunct to Incretin-based Therapies in Adult Participants With Obesity or Overweight With Weight-related Comorbidity With or Without Type 2 Diabetes Mellitus
Obesity or Overweight · PHASE3
Pridopidine Phase 3 Study in Huntington's Disease
Huntington Disease · PHASE3
This explains how clinical research works. It is not medical advice and does not describe any specific condition or treatment. Only a trial site can determine whether someone can take part in a study.