Describes a drug or procedure allowed by the FDA (Food and Drug Administration) for use in clinical trials. Insurance companies tend to deny coverage to procedures, which are described as investigational.
In clinical trials, refers to a drug (including a new drug, dose, combination, or route of administration) or procedure that has undergone basic laboratory testing and received approval from the US Food and Drug Administration (FDA) to be tested in human subjects. A drug or procedure may be approved by the FDA for use in one disease or condition, but be considered investigational in other diseases or conditions. Also called experimental.