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Intramuscular injection
From Wikipedia, the free encyclopedia
Intramuscular injection is the injection of a substance directly into a muscle. In medicine, it is one of several alternative methods for the administration of medications (see Route of administration). It is used for particular forms of medication that are administered in small amounts. Depending on the chemical properties of the drug, the medication may either be absorbed fairly quickly or more gradually. Intramuscular injections are often given in the deltoid, vastus lateralis, ventrogluteal and dorsogluteal muscles. When the gluteal muscles are used, injections should be made on the upper, outer quadrant of the buttock to avoid damaging the sciatic nerve.
Thrombocytopenia (low platelet counts) and coagulopathy (bleeding tendency) are contraindications for intramuscular injections, as they may lead to hematomas.
Examples of medications that are sometimes administered intramuscularly are:
- codeine
- methotrexate
- metoclopramide
- olanzapine
- Streptomycin
- diazepam
- prednisone
- Interferon beta-1a
- sex hormones, such as testosterone, estradiol valerate, and Depo Provera
- dimercaprol
- ketamine
- naloxone
In addition, some vaccines are administered intramuscularly:
- Gardasil
- hepatitis A vaccine
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