The whole arm is full of veins and pumping with blood, why can’t they just inject it anywhere or move downwards, down the arm? Why do they HAVE to inject it in the beginning of the bicep/beginning of arm area?
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As for the site, “begining of bicep” or down the arm, it depends on why they are injecting it. When we pass a cannula for long infusions, we put it in the forearm or hand so you can fold your arm with ease. Whereas when it’s just a single syringe or quick dose, the vein in your elbow, “median cubital vein”, it’s easy and the fluid will go directly to the heart.
As for why in the vein, the injection is given in the vein so it goes directly into the heart and then is diluted and distributed to the body. If I inject an antibiotic into your arm muscle, sure it’ll slowly enter circulation, but it won’t be able to achieve the same therapeutic concentration as injecting it into a blood vessel.
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