What type of medication administration involves the dermis layer?

The type of medication administration that involves the dermis layer is the intradermal injection. This method delivers medication just beneath the outer layer of skin, specifically targeting the dermis, which is the layer of skin located between the epidermis and subcutaneous tissues. Intradermal injections are often used for allergy tests and tuberculosis screening because the shallow administration allows for localized absorption and provides a visible reaction at the site, which is important for diagnostic purposes.

In contrast, intramuscular injections involve the deeper layer of muscle tissue, which allows for a faster absorption rate into the bloodstream due to the vascularity of muscle. Subcutaneous injections are administered into the layer of fat situated beneath the dermis, commonly used for medications that require slower absorption, like insulin. Oral administration involves medications taken by mouth, which are absorbed through the gastrointestinal tract and do not rely on the dermis or skin layers for absorption.