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Many drugs are delivered via injection. This usually comprises the insertion of a hollow needle into the body, where it is used to insert the drug, as fluid. Depending on the site into which the drug is delivered this may be referred to as (for example):
- subcutaneous injection into the subcutaneous tissue
- intradermal injection into the dermis
- intramuscular injection into the muscle, typically the deltoid, muscles of the anterolateral aspect of the thigh, or gluteal muscle (although the gluteal route is generally deprecated due to the risk of damage to the sacral nerve)
- intraosseous injection into the bone
- intraperitoneal injection into the peritoneum