Some drugs work best when they’re injected just under the skin, others when they’re inside a muscle, and others need to be in your bloodstream.
Some parts of your body make it easier to hit each of those things. For instance, your arm for blood veins, your stomach for under the skin, and your rear end for muscles.
Sometimes a doctor will use a certain spot because that’s what he’s used to, and sometimes if you ask, they might be willing to use a different one.
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