Intramuscular injections are often referred to as IM injections. They are also called intramuscular shots, muscle injections, or deep injections. These injections are administered into the muscle of the upper arm, thigh, buttocks, or hip. Intramuscular injections are commonly prescribed for various medications such as vaccines, antibiotics, and hormones. They are often used to deliver medications that require faster and longer-lasting effects. IM injections are administered by healthcare professionals or trained individuals. Getting an IM injection is a simple and effective way to deliver medication directly into the bloodstream.