Clinical Trial

Added on July 02, 2010

A research study that tests a treatment (drug or other therapy) for effectiveness, safety and tolerability.These studies involve at least two groups of participants – one group receives the experimental treatment, and the other group receives a previously established effective treatment, a placebo treatment or no treatment at all. Clinical trials are also called controlled clinical trials (CCTs) or randomized controlled trials (when patients are randomly assigned to treatment and comparison groups.