investigational drug

Meaning of investigational drug: A substance that has been tested in a laboratory and has gotten approval from the U.S.

Definition of investigational drug

A substance that has been tested in a laboratory and has gotten approval from the U.S. Food and Drug Administration (FDA) to be tested in people. An investigational drug 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 drug and investigational agent.