BACKGROUND TO THE DEBATE Placebos are used in trials to conceal whether a treatment is being given or not and hence to control for the psychosomatic effects of offering treatment. Placebo-controlled trials are controversial. Critics of such trials argue that if a proven effective therapy exists, a placebo should not be used. But proponents argue that placebo trials are still crucial to prove th...

Placebos remain highly controversial therapies largely because of their widespread use in research as a comparator rather than a focus of analysis. While a recent systematic review of placebo versus no therapy arms in trials found no difference, the placebo effect in some areas of drug trial research is large and increasing. We attempt to explain this paradox and suggest how clinicians may use ...

The experience of pain arises from both physiological and psychological factors, including one's beliefs and expectations. Thus, placebo treatments that have no intrinsic pharmacological effects may produce analgesia by altering expectations. However, controversy exists regarding whether placebos alter sensory pain transmission, pain affect, or simply produce compliance with the suggestions of ...

This study investigated whether positive ("memory-enhancing") and negative ("memory-impairing") placebos may enhance and undermine, respectively, memory of a film fragment. After watching an emotional film fragment, participants were assigned to a "memory-enhancing" placebo group (n = 30), control group (n = 30), or "memory-impairing" placebo group (n = 30). Only participants who believed in th...

Abstract This short introduction provides a historical and ethical overview of placebos placebo controls in relation to schizophrenia research, with focus on long-term clinical trials. Drawing philosophical scholarship, it sketches two-level analysis issues that the effect raise for field, particularly light shifts trial methodologies practices.

Background and Objective: Currently, no therapeutic or surgical treatment for non-alcoholic fatty liver disease (NAFLD) has been officially approved. This is a serious void in the medical field given the increasing prevalence of NAFLD cases in developing countries. Our study compared the therapeutic effect of metformin, melatonin and vitamin E on serum parameters that are associated with NAFLD ...