Which site is recommended for intramuscular (IM) injection in adults?

The deltoid muscle is recommended as a site for intramuscular (IM) injection in adults primarily due to its accessibility and the muscle's capacity to absorb medications effectively. The deltoid is located in the upper arm and is well-suited for IM injections because it is a large muscle that provides a suitable area for the delivery of vaccines and medications.

Using the deltoid for injections is particularly advantageous because it minimizes the risk of injury to major nerves and blood vessels when the injection is performed correctly. The site is also easy to locate, and the injection can be administered quickly. Additionally, the deltoid allows for self-administration in some cases, such as when patients are receiving vaccinations.

In contrast, the abdomen is not typically used for IM injections; it is more appropriate for subcutaneous injections. The back of the hand and the forearm lack the muscle tissue necessary for effective IM administration, which may result in poor absorption of the medication and an increased risk of complications. Therefore, the deltoid muscle remains the preferred choice for intramuscular injections in adults.