01.08 Injection

There are mainly sites that drugs can be injected into, and the absorption will be different from each of these sites. The sites include intravenous (into the vein), intra-arterial (into the artery), intradermal (into the dermis layer of skin), subcutaneous (under the dermis, in the subcutaneous tissue), intramuscular (into the muscle) (Figure 1.6), intrathecal (into the cerebral spinal fluid), and epidural (into the epidural).

Figure 1.6 Intradermal, Subcutaneous, Intravenous and Intramuscular routes (Copyright QUT, Sheila Doggrell)