open label trial

An open-label trial is a type of clinical trial in which both the researchers and participants know which treatment is being administered. This contrasts with single blind and double blind experimental designs, where participants are not aware of what treatment they are receiving (researchers are also unaware in a double blind trial). An open-label trial may still be randomized.
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The opposite of a double-blind trial. In open label trials, the effectiveness of a treatment is determined with full knowledge of whether or not the patient is taking the medication. Because the expectations of the investigator and patient can subtlely influence the results of such trials, they are considered less useful than double blind trials

a clinical trial of a drug where researchers and patients know which drug is being administered. (also see double-blind, and clinical trial.)

A clinical trial in which both the researchers and the participants know who is getting which drug or vaccine.
See Also: Double-Blind Study
  

A clinical trial<!-- (see) --> in which doctors and participants know which drug or vaccine is being administered.