All of the following are Routes of Administration for drug use, EXCEPT? Inhalation Oral Ingestion injection Subdermal

The route of administration that does not belong to the common methods listed is "Subdermal."

The typical routes of drug administration include:

- **Inhalation**: Breathing in the drug through the lungs.
- **Oral Ingestion**: Taking the drug by mouth.
- **Injection**: Administering the drug directly into the body using a needle.

"Subdermal" refers to something situated or applied under the skin, but it is not a standard term used for drug administration. The more common term related to under-the-skin administration is "subcutaneous," which involves injecting the drug into the tissue layer between the skin and muscle.