The FDA Drug-Approval Process for Allergy Products

What phases does the FDA use to approve a new medication, and why does this process take several years? Why must the active and excipient components of the medication, as well as the device, complete all of the testing phases? Dr. Warner Carr, allergist at Allergy and Asthma Associates in Mission Viejo, California, shares insight from his role as a new drug reviewer at the FDA. How do physicians play a vital role in the drug-approval process by providing clinical feedback to the FDA? Dr. Todd Mahr hosts.