When a drug is administered intradermally, it is placed where in the body?

When a drug is administered intradermally, it is specifically placed within the skin. This method involves injecting the medication into the dermis layer, which is situated just beneath the outer layer of skin (epidermis). Intradermal injections are often used for allergy tests, tuberculosis screening, and some vaccinations because they allow for a localized absorption of medication and can elicit a targeted immune response.

The other options refer to different methods of drug administration. For instance, administering a drug "under the skin" typically describes a subcutaneous injection, while "within the muscle" refers to intramuscular injections. The phrase "between the cheek and gum" pertains to buccal administration, which allows for absorption through the mucous membranes in the mouth. Therefore, the correct identification of the intradermal route as being within the skin is essential for understanding how this type of drug administration works.