This is intramuscular injection, which is a way of drug injection. This has nothing to do with drugs.

Generally, intramuscular injection is to choose a place where the muscle is thicker, and the needle in the injection room is inserted into the muscle, so it is required to relax.

Different from subcutaneous injection, subcutaneous injection is usually on the arm, and the needle is usually inserted obliquely into the skin of the meat, and then gently selected for injection.