<P> Platelet - rich plasma injections can be administered intramuscularly . </P> <P> Certain substances (e.g. ketamine) are injected intramuscularly for recreational purposes . </P> <P> Possible sites for IM injection include: deltoid, dorsogluteal, rectus femoris, vastus lateralis and ventrogluteal muscles . Sites that are bruised, tender, red, swollen, inflamed or scarred are avoided . </P> <P> The deltoid muscle site (upper arm) is recommended for use with injections of small volume, usually equal or less than 1 ml, including vaccinations . This site is not recommended for repeated injections, due to its small area, it is difficult to rotate the injection site . To locate the site, palpate the lower edge of the acromion process . Inject in the upside down triangle that forms with its base at the acromion process and its midpoint in line with the axilla . </P>

The three most commonly used sites for intramuscular injections are
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