An intramuscular (IM) injection is a shot. The needle goes into the muscle to deliver medicine. IM injections are deeper than injections given under the skin. This is usually done by a doctor or nurse. Sometimes, a person may be taught how to inject themselves.
A needle passes through skin and fat layers into the muscle fibers to deliver medication.
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Some medicines are better absorbed when given in the muscle. Other medicines may be given in the muscle if a person is unable to take them by mouth.
Some examples of medicines given using an IM injection are:
Problems are rare, but all procedures have some risk. The doctor will go over some problems that could happen, such as:
To inject yourself:
Depending on the medication, there is usually some discomfort at the injection site. Soreness in the muscle is also common.
Tips for minimizing pain include:
Follow your doctor's instructions regarding care required for the injection site.
Call your doctor if any of the following occur:
If you think you have an emergency, call for medical help right away.
Family Doctor—American Academy of Family Physicians
http://familydoctor.org
National Institute of Allergy and Infectious Diseases
http://www.niaid.nih.gov
Canadian Diabetes Association
http://www.diabetes.ca
Health Canada
http://www.hc-sc.gc.ca
Intramuscular injection (IM). Cincinnati Children's website. Available at: http://www.cincinnatichildrens.org/health/i/intramuscular-injection.
Lesson 2: Administer intramuscular injection. Brookside Associates Multimedia Edition website. Available at: http://brooksidepress.org/intramuscular/lessons/lesson-2-administer-an-intramuscular-injection.
Selecting, evaluating, and using sharps disposal containers website. Centers for Disease Control and Prevention website. Available at: http://www.cdc.gov/niosh/docs/97-111.
Last reviewed May 2020 by James Cornell, MD Last Updated: 5/11/2021