There are three types of injections subcutaneous(under the skin), intramuscular(in a muscle) and intradermal(in the skin) and what you are injecting can depend on the site. The common sites for subcutaneous are the thigh, butt, tricep, and stomach. Intramuscular and intradermals are usually administered by a nurse or physician.
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Intravenous drugs can be injected into almost any available vein, unless the drug is unusually caustic, like chemotherapy, which must go into very large central veins. A common, easily accessible vein is the antecubital vein.