Those that are given into a muscle are not supposed to go in a vein. Quite the opposite actually – if it gets into a vein, it can cause a huge amount of damage.
The way you can know whether the needle is or isn’t in a vein is simple – you just aspire (pull the piston of the syringe). If some blood appears inside the syringe, then the needle is inside a vein.
Not all shots need to go directly into a vein.
If something needs to go into a vein they’ll find one, same as when you give blood. This is common for things like intravenous painkillers, general anesthesia and so on.
For a lot of shots they just need to get it into you and it’ll get absorbed in good time.
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