Definition
Medical speak for injections that go deep into your muscle tissue, as opposed to just under the skin, because sometimes medications need to be delivered with authority. It's the difference between a gentle tap and a solid punch to your deltoid, typically administered by nurses who've perfected the art of the quick jab. Most vaccines and certain medications take this route because muscles are highly vascular and absorb drugs efficiently.
Example Usage
The COVID vaccine is given as an intramuscular injection in your upper arm, which is why it feels like you did an intense shoulder workout the next day.
Source: Medical administration terminology
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