"Intramuscular" refers to a method of delivering medication directly into a muscle. This route allows for faster absorption into the bloodstream compared to other methods, such as oral administration. Common sites for intramuscular injections include the deltoid muscle in the upper arm, the vastus lateralis in the thigh, and the gluteus maximus in the buttocks. Intramuscular injections are often used for vaccines, hormones, and certain medications that require quick action. The technique involves using a syringe and needle to inject the substance deep into the muscle tissue, ensuring it is absorbed effectively and efficiently.