Administration of intramuscular injection – Glass ampoule
An intramuscular injection is administered deep into either the deltoid, ventrogluteal, or vastus lateralis muscle. The site selected will depend on the:
- amount of fluid being injected
- location the previous injection was administered (rotate sites as much as possible)
- medication administration guidelines for a specific medication
The intramuscular route can take larger volumes and more irritating solutions than the subcutaneous route. In addition, the rate of absorption is quicker due to the greater blood supply. Medications commonly administered intramuscularly include narcotics and antibiotics.