1. To incorporate into a compound a substance that is readily detected, such as a radionuclide, whereby its metabolism can be followed or its physical distribution detected.
2. The substance so incorporated.
3. Any display of written, printed, or graphic materials accompanying a pharmaceutical or a medical device at any time while such is in interstate commerce or offered for sale; often used as a synonym for package insert (q.v.).
Stedman’s Medical Dictionary © Wolters Kluwer Health. All rights reserved.