Dextromethorphan Distribution Act of 2007 - Amends the Federal Food, Drug, and Cosmetic Act to deem to be adulterated any unfinished dextromethorphan that is possessed, received, or distributed in violation of this Act.
Prohibits a person from: (1) possessing or receiving unfinished dextromethorphan unless the person is registered with the Secretary of Health and Human Services as a producer of a drug or device; or (2) distributing unfinished dextromethorphan to any person other than a registered person. Excludes from such prohibitions common carriers that possess, receive, or distributed unfinished dextromethorphan between registered persons.